Andrey Prosvirin

Corning Incorporated | Corning

The non-judicious use of herbicides has led to a widespread evolution of herbicide resistance in various weed species including Palmer amaranth, one of the most aggressive and troublesome weeds in the United States. Early detection of herbicide resistance in weed populations may help growers devise alternative management strategies before resistanc...

Laser and Plasma Technologies (LPT) has developed a sub-coating detection system, the LPT-S2. This handheld system is able to "see" through painted surfaces to detect incipient corrosion, image composite structures, and discover sub-surface defects. Examination of aircraft and other military assets for corrosion and structural defects is still heav...

UV irradiation is one of the most harmful exogenous factors for plants. Reactive oxygen species promote oxidative stress and can damage DNA. Carotenes are present in plants, in part, to prevent damage by scavenging these oxygenated radical species. The speed of response of the organism in production of carotenes is related to adaptation for surviva...

Revolutionary instrumentation is currently being developed through a partnership between Texas A&M, Harbor Branch Oceanographic Institution, and WET Labs for the measurement of the backscattering coefficient bb and the total scattering coefficient b. For decades, simple instrumentation to obtain the important bb coefficient has been pursued, howeve...

The syntheses, structures, and magnetic properties of four new complex salts, (PPN){[MnIII(salphen)(MeOH)]2[MIII(CN)6]}·7MeOH (Mn2M·7MeOH) (M = Fe, Ru, Os and Co; PPN+ = bis(triphenylphosphoranylidene)ammonium cation; H2salphen = N,N′-bis(salicylidene)-1,2-diaminobenzene), and a mixed metal Co/Os analogue (PPN){[MnIII(salphen)(MeOH)]2[CoIII0.92OsII...

Host-guest interactions between the aromatic molecules benzene, toluene, aniline and nitrobenzene and the redox-active TCNQ-based metal-organic framework (MOF), Fe(TCNQ)(4,4[prime or minute]-bpy) (1) (TCNQ = 7,7,8,8-tetracyanoquinodimethane), have been found to modulate spontaneous magnetization behaviours at low temperatures. An analogous MOF, Mn(...

Magnetic metal-organic frameworks (MOFs) are promising for potential applications in low density data storage, small molecule recognition and sensors. The redox-active tetracyanoquinodimethane (TCNQ) dianion can be employed as a substitute for carboxylate anions in the formations of MOFs that may exhibit interesting charge-transfer interactions bet...

Two different nickel precursors (NiCl2 or Ni(CH3COCH2COCH3)2) in the presence of 1-dodecanethiol and a mixture of oleylamine and oleic acid were used for a one-pot colloidal synthesis to produce high purity Ni3S4 nanoparticles with controlled shapes in high yields and narrow size distributions. By simply changing the nickel precursors, the shape of...

A family of magnetic metal–organic frameworks, (Ph3PMe)2[M2(TCNQ)3] {M=Fe2+, Co2+, Ni2+ and Zn2+} have been prepared and structurally characterized. The honeycomb-like “layers” consist of MII ions doubly bridged with dinitrilomethane moieties of two 7,7,8,8-tetracyanoquinodimethane (TCNQ) dianions which are further connected through phenyl rings to...

Treatment of [Mn(dpop)(H2O)2]Cl2 (dpop = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo-[12.3.1]octadeca-1(18),2,12,14,16-pentaene) with K4[Mo(CN)7]·2H2O under varied synthetic conditions afforded four different compounds: {[Mn(dpop)]4[(dpop)Mn(H2O)]2[Mo(III)(CN)7]3·27H2O}n (), {[(dpop)Mn(H2O)][Mo(III)(CN)7][Mn(dpop)]3[Mo(IV)(CN)8]·29H2O}n (), {[(dpop)M...

Reactions of tptz complexes of Cu(II), Co(II), and Fe(III) with [M-V(CN)(8)](3-) (M = Mo, W) anions produced three new heterobimetallic chain compounds (2-4). The mer-capped building block [Cu-II(tptz)(CF3SO3)(2)(CH3OH)]center dot 2H(2)O (1) (tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) was also isolated. The structures of 2, 3, and 4 consist of li...

A series of isostructural octanuclear lanthanide complexes of general formula [Ln8(sao)4(μ3-OH)4(NO3)12(DMF)12] (Ln = Nd (), Sm (), Eu (), Gd (), Tb (), Dy (), Ho (), Er (); DMF = dimethylformamide) have been prepared via the reactions of salicylaldoxime (saoH2), tetramethylammonium hydroxide (Me4NOH) and the appropriate lanthanide nitrate salt (Ln...

Hydrothermal reactions of sodium vanadate, methylenediphosphonic acid, hydrogen fluoride and the appropriate organoamine yielded the vanadium(IV)-oxyfluoride compounds [NH3(CH2)2(NH2)(CH2)2NH3]3[{Na(H2O)} ⊂ {V4O4F2(O3PCH2PO3)4}]·8H2O (1·8H2O) and [NH3(CH2)2(NH2)(CH2)2(NH2)(CH2)NH3]2[{Na(H2O)} ⊂ {V4HO4F2(O3PCH2PO3)4}]·7H2O (2·7H2O). The vanadium-oxy...

Hydrothermal reactions of cobalt or nickel sulfate with the appropriate substituted tetrazole yielded a series of compounds of the M(II)/tetrazolate/sulfate family. While the parent compound [Co(prztet)2(H2O)2]·0.5H2O (1·0.5H2O; prztet = pyrazinetetrazolate) is molecular, the remaining materials exhibit extended structures. Thus, [Co2(4-pyrtet)(SO4...

The reaction of 2-pyridylphosphonic acid (LH2) with iron(II) perchlorate and iron(III) nitrate afforded an interconnected, double-layered, cationic iron cage, [{Fe36L44(H2O)48}]20+ (1a), the largest interconnected, polynuclear ferric cage reported to date. Magnetic studies on 1a revealed antiferromagnetic coupling between the spins on adjacent FeII...

Hydrothermal reactions of copper(II) acetate, tetrazolate-5-carboxylate (tzc), and the neutral N-donor spacer ligand 1,3-di(4-pyridyl)propane (dpp) lead in a single reaction vial to the simultaneous formation of three different single-crystalline solvates [Cu(tzc)(dpp)]n·0.5C6H14·0.5H2O (1), [Cu(tzc)(dpp)]n·4.5H2O (2), and [Cu(tzc)(dpp)]n·1.25C6H14...

The reaction of 2-pyridylphosphonic acid (LH(2)) with iron(II) perchlorate and iron(III) nitrate afforded an interconnected, double-layered, cationic iron cage, [{Fe(36)L(44)(H(2)O)(48)}](20+) (1a), the largest interconnected, polynuclear ferric cage reported to date. Magnetic studies on 1a revealed antiferromagnetic coupling between the spins on a...

Single Molecule Magnets (SMMs) are a remarkable class of molecules that display magnetic bistability of a molecular origin which, in its original description, arises from the combination of a high ground state electron spin (S) and a large negative uniaxial (Ising) zero-field splitting |D|. This magnetic bistability provides an excellent potential...

Two for one: Two unusual magnets based on the [Mo(CN)(7) ](4-) building block with Mn(II) linkers have been prepared with different topological 3D networks. Conversion of one into the other is triggered by dehydration during a single-crystal to single-crystal event (see picture; Mn: dark red, Mo: pink, C: green, N: blue, O: red).

In this work, we present a detailed AC magnetic susceptibility investigation of the metamagnet {[Mn(OH)(CH3CO2)2]·CH3CO2H·H2O}∞ (1). Compound 1 was previously reported and the magnetic properties were investigated. The data revealed that the compound is a linear-chain antiferromagnet with a phase transition at TN = 6.1 K to an ordered antiferromagn...

Ribbon-like coordination polymers composed of Ce(III) ions and TCNQX(2) (TCNQ=tetracyanoquinodimethane; X=Cl, Br), but not TCNQ radicals, show unexpected magnetic ordering (see picture; Ce green). This behavior reveals remarkable subtlety for magnetic properties of lanthanide-organic materials.

Hydrothermal reactions of Cu(SO4)·5H2O with pyridyl- and pyrazine-substituted tetrazoles provided a series of materials of the Cu(II)/imine-tetrazolate/SO42– class. [Cu3(OH)(H2O)3(3-pyrHtet-O)3(SO4)] (1) (3-pyrHtet-O = 2-hydroxy-3-Hpyridyltetrazolate) is molecular and exhibits the common {Cu3(μ3-OH)}5+ core. In addition, the pyridyl group of the li...

The use of a moderately hydrophobic ionic liquid, 1-butyl-2,3-dimethylimidazolium tetrafluoroborate ([BdMIM][BF(4)]), as a cosolvent with water, has been investigated in the synthesis of metal phosphonates. This hydro-ionothermal synthesis has been carried out through a systematic combinatorial investigation of several divalent metal chlorides and...

The hydrothermal chemistry of a variety of M(II)SO(4) salts with the tetrazole (Ht) ligands 5,5'-(1,4-phenylene)bis(1H-tetrazole) (H(2)bdt), 5',5''-(1,1'-biphenyl)4,4'-diylbis(1H-tetrazole) (H(2)dbdt) and 5,5',5''-(1,3,5-phenylene)tris(1H-tetrazole) (H(3)btt) was investigated. In the case of Co(II), three phases were isolated, two of which incorpor...

Hochgradig leitfähige Koordinationspolymere vom Typ [M(4,4′-bpy)(η1-TCNQ)2(CH3OH)2]TCNQ (M=Mn, Zn) wurden mit TCNQ (7,7,8,8-Tetracyanochinodimethan) als Baustein hergestellt (siehe Bild). Stapel von TCNQ mit regelmäßigen Abständen sind durch zwei η1-TCNQ-Liganden aus einem Stapel mit freien TCNQ-Radikalen mit einem MnII-4,4′-Bipyridin-Rückgrat verb...

Three members of the family of trigonal bipyramidal (TBP) complexes of general formula [M(tmphen)(2)](3)[M'(CN)(6)](2) (tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline) or [M(3)M'(2)], which are known to exhibit thermally induced spin crossover and charge transfer, have been investigated for optical and photomagnetic properties. The light-induced...

The photomagnetic title compound is prepared from a 2:3 mixture of (PPN)3[Os(CN)6] and Co(NO3)2 in a H2O/MeOH mixture (10 °C, 12 h, 77% yield).

To expand the field of new cyanide materials of the 5d elements, we incorporated the [Os(CN)(6)](3-) anion into PB architectures in combination with the Co(II) cation. Herein, we report the first example of a photomagnetic PB analog containing Os(III) ions. In a similar vein as the prototypical CoFe PB analogs, this compound exhibits a wide variety...

A record-breaking high-spin state is observed in a molecule based on the [Mo(CN)7]4− building block. As K. R. Dunbar and co-workers describe in their Communication on page 5081 ff., the anionic nanosized docosanuclear {Mo8Mn14} cluster is the first discrete compound based on [Mo(CN)7]4−. The compound contains the most paramagnetic centers (22) and...

I'll take the high road: An anionic nanosize docosanuclear {Mo 8Mn14} cluster based on the [Mo (CN)7] 4- unit was synthesized and fully characterized by X-ray and magnetic studies. This molecule (see picture; Mo red, Mn purple, C gray, N blue) is the first discrete compound based on [Mo(CN)7]4- and contains the most paramagnetic centers (22) and th...

Ein rekordverdachtiger High-Spin-Zustand verhilft einer Cyanidverbindung basierend auf dem [Mo(CN)7]4−-Baustein zur Goldmedaille in der Cyanid-Klasse. Wie K. R. Dunbar et al. in der Zuschrift auf S. 5207 ff. berichten, reprasentiert der nanometergrose Docosacluster {Mo8Mn14} die erste diskrete Verbindung des [Mo(CN)7]4−-Bausteins. Die Verbindung en...

The trigonal bipyramidal molecules [M(tmphen)(2)](3)[Mo(CN)(6)](2).(solvent) (M = Co, Ni; tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline) based on the [Mo(III)(CN)(6)](3-) unit were prepared by loss of a cyanide ligand from [Mo(III)(CN)(7)](4-) and found to exhibit ferromagnetic interactions between the M(II) and Mo(III) centers.

Derivatives of the single molecule magnet (SMM) {[Re(triphos)(CN)(3)](4)[MnCl](4)} (Re(4)Mn(4)) {[Re(triphos)(CN)(3)](4)[Mn(CH(3)CN)](4)}(ClO(4))(4) (2) and {[Re(triphos)(CN)(3)](4)[Mn(ClO(4))](3)[Mn(CH(3)OH)(CH(3)O)]} (3), were prepared by reacting [Et(4)N][Re(triphos)(CN)(3)] (1) with Mn(ClO(4))(2)·6H(2)O. Reaction of sodium dicyanamide, NaN(CN)(...

Reactions between trivalent rare earth ions (M(III) = La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er and Yb) and the radical anion of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (TCNQF(4)) produce a family of mononuclear complexes {M[(TCNQF(4))](2)[H(2)O](x)}.(TCNQF(4))(3H(2)O), x = 6, 7. The cationic complex {M(III)([TCNQF(4)](-) )(2)[H(2)O](x)}(+) c...

A novel class of alumina/silica–transition metal based materials has been synthesized via sol–gel method. The materials exhibit Type I adsorption/desorption isotherms with the pores mainly in the range 10–20 Å. The pore size, surface area and the pore volume are strongly correlated with the size of the alkylamine template employed. The versatile sy...

The reaction of copper(I) chloride with Htbo (1,4,6-triazabicyclo[3.3.0]oct-4-ene) under reflux in THF with oxidation by oxygen, produces a neutral cluster comprising two oxo-tetra-copper(II) units connected by six tbo− bridges three of them bind two and the other three bind four metals; each unit also contains three chlorine bridges and a Htbo ter...

Single crystals of a new structure type for the M+(TCNQ) • - binary family are isolated from reactions of dihalogenated TCNQ derivatives and CuI ions (see figure; Cu: Pink C: black, N: blue, Br: orange, H: The new compound Cu(TCNQCI2) exhibits the highest con-ductivity of the M+(TCNQ)• - series to date, despite the larger separation of TCNQCI2 unit...

1 H, 2 H, 29 Si, 27 Al MAS NMR Relaxation time Nanoparticles Silica–alumina–NiO based materials a b s t r a c t Microporous materials SiO 2 –Al 2 O 3 –NiO with a pore size of 8–20 Å, prepared by the sol–gel method at wide variation in Ni 2+ concentrations, have been studied by X-ray diffraction, X-ray photoelectron spec-troscopy, transmission elect...

A series of isostructural compounds with formula [M(TCNQF(4))(2)(H(2)O)(6)]TCNQF(4)3 H(2)O (M=Tb (1), Y (2), Y:Tb (74:26) (3), and Y:Tb (97:3) (4); TCNQF(4)= tetrafluorotetracyanoquinodimethane) were prepared and their magnetic properties investigated. Compounds 1, 3, and 4 show the beginning of a frequency-dependent out-of-phase ac signal, and dec...

The preparation, single crystal X-ray crystallography, and magnetic properties are reported for four new clusters based on [M'V(CN)8]3- octacyanometallates (M'=Mo, W). Reactions of [M'V(CN)8]3- with mononuclear NiII ions in the presence of the tmphen blocking ligand (tmphen=3,4,7,8-tetramethyl-1,10-phenanthroline) in a 2:3:6 ratio, respectively, le...

Supermicroporous paramagnetic materials SiO(2)-Al(2)O(3)-MnO and SiO(2)-MnO with different manganese concentrations have been probed by solid-state (29)Si NMR and magnetic susceptibility measurements. The (29)Si T(1) and T(2) experiments, performed in static and spinning samples, have resulted in determination of electron relaxation times, providin...

Water-free rare earth(III) hexacyanoferrate(III) complexes, {Ln(DMF)(6)(mu-CN)(2)Fe(CN)(4)}(infinity) (DMF = N,N-dimethylformamide; Ln = Sm, 1; Eu, 2; Gd, 3; Tb, 4; Dy, 5; Ho, 6; Er, 7; Tm, 8; Yb, 9; Lu, 10; Y, 11; La, 12; Ce, 13; Pr, 14; Nd, 15), were synthesized in dry DMF through the metathesis reactions of [(18-crown-6)K](3)Fe(CN)(6) with LnX(3...

This article is a part of our efforts to control the magnetic anisotropy in cyanide-based exchange-coupled systems with the eventual goal to obtain single-molecule magnets with higher blocking temperatures. We give the theoretical interpretation of the magnetic properties of the new pentanuclear complex {[Ni(II)(tmphen)(2)](3)[Os(III)(CN)(6)](2)} x...

Fixing a hole: Hydrothermal chemistry has been exploited in the preparation of a 3D framework material exhibiting 48% accessible void volume and 1.5% hydrogen uptake by weight at 120 kPa (see picture). The title compound also exhibits single-chain magnetic behavior and reversible changes in magnetic properties upon solvation and desolvation.

The hexacyanoosmate(III) anion was used to prepare a pentanuclear cyanide bridged molecular cluster with ligand-protected Ni(II) ions as well as the corresponding Prussian blue phase from a reaction with aqueous Ni(II) ions.

In this article we report for the first time experimental details concerning the synthesis and full characterization (including the single-crystal X-ray structure) of the spin-canted zigzag-chain compound [Co(H2L)(H2O)]infinity [L = 4-Me-C6H4-CH2N(CPO3H2)2], which contains antiferromagnetically coupled, highly magnetically anisotropic Co(II) ions w...

Microporous silica-based materials SiO2-Al2O3-NiO with a predominant pore size in the range 8-20 Aring, prepared by the sol-gel method by variation in Ni2+ concentrations from 0 to 30 weight %, have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy. The nature of the nickel centers has been studied by magnetic susceptibility...

The syntheses, structures, and magnetic properties of a series of tetranuclear cyanide-bridged compounds are reported. This family of molecular squares, [{M(II)Cl2}2{Co(II)(triphos)(CN)2}2] (M = Mn ([CoMn]), Fe ([CoFe]), Co ([CoCo]), Ni ([CoNi]), and Zn ([CoZn]), triphos = 1,1,1-tris(diphenylphosphinomethyl)ethane), has been synthesized by the reac...

A new cobalt(II) carboxylate-phosphonate, namely, Co[HO2C(CH2)3NH(CH2PO3H)2]2, with a layered architecture has been synthesized by hydrothermal reactions. The Co(II) ion in the title compound is octahedrally coordinated by six phosphonate oxygen atoms from four carboxylate phosphonate ligands. Neighboring CoO6 octahedra are interconnected by phosph...

Hydrothermal conditions have been used in the preparation of a series of organic-inorganic hybrid materials of the cobalt-molybdophosphonate family. The reactions of MoO(3), cobalt(II) acetate or cobalt(II) acetylacetonate, tetra-2-pyridylpyrazine (tpyprz), and organodiphosphonic acids H(2)O(3)P(CH(2))nPO(3)H(2) (n = 1-5 and 9) of varying tether le...

In this work, we describe an unusual type of nanowire obtained from a decomposition of Mn12-Ac. The structure of [Mn(OH)(CH3CO2)2]CH3CO2HH2O∞, consists of neutral 1-D chains based on the six coordinate Mn(III) centers [1]. AC magnetic susceptibility measurements reveal to the appearance of an out-of-phase signal, chi"m in the range of 1.8-2.6 K. Th...

Removal of methanol molecules from the interstices of a metal-organic framework based on a 2-D hexagonal Mn(II)-TCNQF(4) net results in stronger magnetic interactions and leads to a glassy magnetically ordered state; the magnetic behavior can be reversibly cycled upon solvation-desolvation of the material.

Hydrothermal reactions of manganese(II) salts with m-sulfophenylphosphonic acid (m-HO3S-Ph-PO3H2, H3L) and 1,10-phenanthroline (phen) led to six novel manganese(II) sulfonate-phosphonates, namely, [Mn2(HL)2(phen)4][Mn2(HL)2(phen)4(H2O)](2).6H2O (1), [Mn4(L)2(phen)8(H2O)2][ClO4](2).3H2O (2), [Mn(phen)(H2O)4]2[Mn4(L)4(phen)4].10H2O (3), [Mn6(L)4(phen...

Hydrothermal chemistry has been exploited in the preparation of a series of manganese(II), iron(II), and nickel(II) triazolate frameworks, [Mn7(trz)8(CH3CO2)4(OH)2].2.5H2O (1.2.5H2O), [Mn5(Htrz)2(SO4)4(OH)2] (2), [Fe5(Htrz)2(SO4)4(OH)2] (3), [Fe3(Htrz)3(HSO4)(SO4)2(OH)].H2O (4.H2O), [Ni3(trz)3(OH)3(H2O)4].5H2O (5.5H2O), and [Ni3(trz)5(OH)].2.5H2O (...

A series of structurally related pseudocubic metal cyanide clusters of Re(II) and 3d metal ions [{MX}4{Re(triphos)(CN)3}4] (M = Mn, Fe, Co, Ni, Zn; X = Cl, I, -OCH3) have been prepared, and their magnetic and electrochemical properties have been probed to evaluate the effect of changing the identity of the 3d metal ion. Electrochemistry of the clus...

A series of metal-organic hybrid compounds were synthesized using two new phosphonic acids, pyridyl-4-phosphonic acid and p-xylylenediphosphonic acid (H2O3PCH2C6H4CH 2PO3H2). The phosphonic acid ligands have been synthesized from their corresponding bromides following two different types of reactions. The reaction of pyridyl-4-phosphonic acid with...

Reactions between [M'(III)(CN)(6)](3-) anions (M' = Co, Cr, or Fe) and mononuclear complexes of M(II) ions (M = Cr, Mn, Co, Ni, or Zn) produce a family of pentanuclear clusters {[M(tmphen)(2)](3)[M'(CN)(6)](2)]}. The core of the clusters is formed by five metal ions that are bridged through six CN- linkers into a trigonal bipyramid, with M and M' i...

A theoretical model is developed for the explanation of the magnetic properties of the [MnCl] 4 [Re(triphos)(CN) 3 ] 4 single molecule magnet, which represents a 3d–5d molecular cube compressed along one of the C 3 axes. In the model, the strong local trigonal crystal field on each Re(II) ion is assumed to split the ground cubic 2 T 2 (t 5 2) term...

A series of cyanide-bridged chain mixed Fe(III)/Ln(III) (Ln=Pr, Nd, Sm, Eu, Gd, Tb) complexes with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz) used as a capping group has been prepared. Reactions of tptz and LnCl3 with K3Fe(CN)6 yield a family of air-stable 1-D compounds {[Pr(tptz)(H2O)4Fe(CN)6].8H2O}infinity, {[Nd(tptz)(H2O)4F...

Reactions of [W(CN)(8)](3-/4-) anions with complexes of Mn(2+) ion with tridentate organic ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) lead to a series of heterobimetallic complexes. The crystal structures of these compounds are derived from the same basic structural fragment, namely a W(2)Mn(2) square constructed of alternating cyanide-brid...

The paper is aimed at the elucidation of the main factors responsible for the single-chain magnet behavior of the cobalt(II) disphosphonate compound Co(H2L)(H2O) with a 1D structure. The model takes into account the spin-orbit interaction, the axial component of the octahedral crystal field acting on the ground-state cubic 4T1 terms of the Co(II) i...

The hydrothermal reactions of 1,2,4-triazole with the appropriate copper salts yield a series of framework materials of the Cu/triazolate/X system with X = F-, Cl-, Br-, I-, and SO42-. A CuII species ([Cu3(trz)4(H2O)3]F2), four CuI species ([Cu6(trz)4Br2], [Cu6(trz)4Br]Cu4Br4(OH), [Cu4(trz)3]OH·7.5H2O, and [Cu3(trz)I2]), and four mixed-valence CuI/...

Six new divalent metal selenites have been synthesized by hydro-/solvothermal methods which leads to the incorporation of the organic template as a cation or a ligand. The structure of [H(2)pip][Cu(SeO(3))(2)] (1) (pip=piperazine) features 1D anionic chains of [Cu(SeO(3))(2)](2-) which are cross-linked by the template cations through hydrogen bonds...

Low angle X-ray scattering studies have been used to identify the mesophase of some calamitic lanthanide mesogens as smectic A, while magnetic birefringence studies have shown a huge magnetic anisotropy for these complexes.

Hydrothermal reactions of divalent transition metal salts with imino-bis(methylphosphonic acid), NH(CH2PO3H2)2 (H4L) afforded three new metal phosphonates, namely, Cu[NH(CH2PO3H)2] 1, {Co[NH2(CH2PO3H)(CH2PO3)](H2O)2}·H2O 2 and Mn[NH2(CH2PO3H)(CH2PO3)](H2O) 3. When HO2C(CH2)3N(CH2PO3H2)2 was used as the phosphonate ligand and 4,4′-bipy as the second...

Single crystals of two new coordination polymers {Fe(C5N3O)2(CH3CN)2}∞ (1) and {Co(C5N3O)2(C4H4O)2}∞ (2) have been prepared and their structures and magnetic properties determined. Reactions of TCNE with Fe4Cl8(THF)6 in acetonitrile/diethyl ether and TCNE with Co4Cl8(THF)6 in tetrahydrofuran both lead to the transformation of TCNE to 1,2,2-tricyano...

Treatment of several divalent transition-metal trifluoromethanesulfonates [M(II)(OTf)2; M(II) = Mn, Co, Ni] with [NEt4][Tp*Fe(III)(CN)3] [Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate] in DMF affords three isostructural rectangular clusters of {[Tp*Fe(III)(CN)3M(II)(DMF)4]2[OTf]2} x 2DMF (M(II) = Mn, 3; Co, 4; Ni, 5) stoichiometry. Magnetic stu...

The synthesis and characterization of a new N3O donor ligand N-benzyl-N-((6-pivaloylamido-2-pyridyl)methyl)-N-(2-pyridylmethyl)amine (bpppa) is reported. Treatment of bpppa with Mn(II)(ClO4)2·6H2O in acetonitrile solution yielded the mononuclear [(bpppa)Mn(CH3CN)(H2O)](ClO4)2 (1) which was characterized by X-ray crystallography, elemental analysis,...

Reactions of Fe(II) salts with the ligand 1,4,5,8,9,12-hexaazatriphenylene (HAT) led to the isolation and characterization of four new compounds: [Fe3(HAT)(H2O)12](SO4)3.3.3H2O (1), [Fe2(HAT)(SO4)(H2O)5](SO4).2H2O.CH3OH (2), [Fe2(HAT)(SO4)(H2O)5](SO4).3H2O (3), and [Fe3Cl5(HAT)(CH3OH)4(H2O)]Cl (4). Compound 1 crystallizes as a trinuclear cluster in...

The new cobalt diphosphonate compound with a 1D zig–zag chain structure is the first example of its kind that has been recognized to exhibit single-molecule magnets behavior. The slow paramagnetic relaxation of the magnetization is explained on the basis of Ising anisotropy resulting from spin canting of antiferromagnetically coupled Co ions. The e...

A high spin molecular square of square pyramidal CoII and tetrahedral MnII corners exhibiting an overall S = 4 ground state has been crystallized and its magnetic properties investigated.

A pseudocubic, paramagnetic cluster of ReII and MnII, [{MnCl}4{Re(triphos)(CN)3}4], has been prepared, and its magnetic properties have been investigated. Antiferromagnetic coupling is observed between the "S = 1/2" ReII and S = 5/2 MnII centers resulting in an effective S = 8 ground state. AC susceptibility studies reveal that the molecule is a si...

Zwei cyanidverbrückte molekulare Würfel der allgemeinen Formel {[MCl]4[ReII(triphos)(CN)3]4} (M=Fe, Co (gezeigt), triphos=1,1,1-Tris(diphenylphosphanylmethyl)ethan) und ihre magnetischen Eigenschaften werden vorgestellt. Die Würfel entstanden aus [Et4N][ReII(triphos)(CN)3] und dem entsprechenden zweiwertigen Metallhalogenid und bestehen aus durch C...

The hydrothermal syntheses and crystal structures of two novel cobalt carboxylate−phosphonates with 4,4′-bipyridine (4,4′-bipy) as the secondary metal linker are reported. Compound 1, [Co3(H2L)2(H2O)4(4,4′-bipy)], where H5L = 4-HO2CC6H4CH2N(CH2PO3H2)2, crystallizes in the monoclinic space group C2/c with a = 25.9281(5), b = 9.76310(10), c = 17.3671...

The hydrothermal syntheses, structures, and magnetic properties of the Cu(II), Co(II), and Mn(II) complexes with organophosphonic acid H2O3PCH2NH2+CH2PO3H- are reported. Compound Cu3[NH2(CH2PO3)2]2 (1) crystallizes in the orthorhombic space group Pbca, with unit cell parameters a = 9.4430(10) Å, b = 9.3681(10) Å, c = 16.0755(17) Å, V = 1422.1(3) Å3...

We report the isolation of two fully substituted Jahn−Teller “Mn12” structural isomers, Mn12O12(CF3COO)16(OH2)4. This investigation underscores how three methods of characterization were required to effectively characterize the two products, namely, single-crystal X-ray diffraction studies to determine the structural motifs, ESI-MS to confirm the c...

The rodlike FeIII complex of an N-alkyloxysalicylidenyl-N′-ethyl-N-ethylenediamine ligand, shown as a computer model in the picture, is the first compound in which spin-crossover (SC) and liquid-crystalline (LC) properties coexist. This synergy should allow the magnetic and optical properties of SC compounds to be combined with the sensitivity of t...

The reaction of Schiff"s base L with lanthanide alkylsulfates affords liquid crystalline complexes with the general formula L3Ln(CnH2n+1OSO3)3. The liquid crystalline structure and magnetic properties are studied by polarization thermal microscopy, differential scanning calorimetry, X-ray diffraction, and measurement of magnetic susceptibility. The...

Lanthanide complexes of the Schiff base ligand 4-dodecyloxy-N-hexadecyl-2-hydroxybenzaldimine and with perfluorinated alkyl sulfate counterions were synthesised. All of the metal complexes show a smectic A mesophase. The viscosity of this mesophase is much lower than that of analogous compounds with nitrate or alkyl sulfate counterions. The behavio...

Comb-shaped LC ionomers containing Cu2+ ions were synthesized, and their phase behavior was studied. It was shown that, at low concentrations of the metal ions (∼2 mol %), an SA phase appears; an increase in the concentration of copper ions is accompanied by a rise in the clearing point and glass transition temperature. The effect of the concentrat...

Lanthanide complexes of the Schiff base ligand 4-dodecyloxy-N-hexadecyl-2-hydroxybenzaldimine and with perfluorinated alkyl sulfate counterions were synthesised. All of the metal complexes show a smectic A mesophase. The viscosity of this mesophase is much lower than that of analogous compounds with nitrate or alkyl sulfate counterions. The behavio...

Comb LC ionomers containing Cu2+ ions were synthesized, and their phase behavior was studied. It was shown that, at the low concentrations of the metal ions in ionomers (≈2 mol %), an SA phase appears; an increase in the concentration of copper ions is accompanied by a rise in the clearing point and glass transition temperature. The effect of the c...

Lanthanide complexes of the Schiff base ligand 4-dodecyloxy-N-hexadecyl-2-hydroxybenzaldimine and with perfluorinated alkyl sulfate counterions were synthesised. All of the metal complexes show a smectic A mesophase. The viscosity of this mesophase is much lower than that of analogous compounds with nitrate or alkyl sulfate counterions. The behavio...

Rare-earth-containing metallomesogens with 4-alkoxy-N-alkyl-2-hydroxybenzaldimine ligands are reported. The stoichiometry of the complexes is [Ln(LH)(3)(NO3)(3)], where Ln is the trivalent rare-earth ion;(Y, La, and Pr to Lu, except Pm) and LH is the Schiff base. The Schiff base ligands are in the zwitterionic form and coordinate through the phenol...

The new series of the LC ionomers containing copper ions has been obtained and their phase behavior has been studied. It was shown that at low metal ion concentrations in the LC ionomers (˜2 mol-%) the induction of the SmA phase is observed. An increase in the copper ion concentration is accompanied by a slight rise in clearing and glass transition...

Exchange-coupled Cr3+ centers in KB-4 cationite and AN-2FN, AN-31, and AV-16 Gs anionites were studied by the EPR method at maximum fillings of polymer matrices by chromium. In anionites, the Cr3+ state was attained in reduction of hexavalent chromium to penta- and then trivalent chromium. Exchange was shown to be antiferromagnetic. The experimenta...

Complexes of the composition L(LH)2Ln(NO3)2 (Ln = La, Dy, Gd, Er, Eu, or Tb) were obtained by the reaction of ß-aminovinyl ketone (LH) with rare earth metal nitrates. All the compounds synthesized are thermotropic liquid crystals having the smectic SA phase. The values of magnetic anisotropy of these complexes measured by magnetic birefringence are...

The behavior of the wide range of paramagnetic liquid crystalline complexes of Cu and VO was investigated by means of the EPR technique and magnetic susceptibility measurements in different kinds of mesophases. The investigation of EPR spectra shape made it possible to determine molecular orientation in external magnetic field. The temperature depe...

The behaviour of a large number of paramagnetic metallo-mesogenic molecules with Cu and VO in different mesophases in a magnetic field was investigated by EPR techniques and magnetic susceptibility measurements. The investigation of the angular dependence of the EPR spectra enabled conclusions to be reached concerning the molecular orientation in t...

The behavior of the wide range of paramagnetic liquid crystalline complexes of Cu and VO was investigated by means of the EPR technique and magnetic susceptibility measurements in different kinds of mesophases. The investigation of EPR spectra shape made it possible to determine molecular orientation in external magnetic field. The temperature depe...

Liquid crystalline complexes of the type [ML(LH)2](NO3)2, where LH=C7H15O-C6H3(OH)CH=N-C18H37 and M=Gd, Dy, and La, have been obtained. All of them exhibit the SA phase and have high magnetic birefringence constants due to the association of the complexes in solution. In the case of the dysprosium derivative, the effect is much stronger (four order...