Marina Cindrić

University of Zagreb · Department of Chemistry (PMF)

The propensity of 4-hydroxybenzhydrazone-related ligands derived from 3-methoxysalicylaldehyde (H2L3OMe), 4-methoxysalicylaldehyde (H2L4OMe), and salicylaldehyde (H2LH) to act as chelating and/or bridging ligands in Ni(II) complexes was investigated. Three clusters of different nuclearities, [Ni3(L3OMe)2(OAc)2(MeOH)2]∙2MeOH∙MeCN (1∙2MeOH∙MeCN), [Ni...

Complex salts [1H]X and [1H](XA)0.5·2MeOH, and co-crystals [1H]X·0.5VA (X = chloride or bromide, XA = chloranilate or bromanilate, VA = o-vanillin azine), comprising [MoO2(HL)(MeOH)]+ ([1H]+) cation (H2L = 3-methoxysalicylaldehyde isonicotinoyl hydrazone), were prepared either by solution-based synthesis or by mechanochemical synthesis. Whereas [1H...

We describe the impact of mono- and dicarboxylic acids on the formation of polyoxomolybdates of different nuclearities, such as {Mo 5 O 17 }, {Mo 5 O 18 }, {Mo 8 O 26 }, and {SiMo 12 O 40 }.

Different synthetic routes, solution-based methods performed at room temperature, under reflux or hydrothermally at 110 °C, along with mechanochemically accelerated (hand grinding or liquid-assisted ball milling) vapour-assisted aging, yielded polyoxomolybdate [Co(en)3]2[Mo7O24]·8H2O (1) as the final product. The new heptamolybdate 1 was the only p...

Synthesis and structures of the Mo(VI) coordination polymer [MoO2(L)]n (1), mononuclear complexes [MoO2(L)(MeOH)] (2α, 2β, and 2γ), and salts [MoO2(HL)(MeOH)]X, where X = Cl (3), Br (4), NO3 (5), and MeOSO3 (6), and L = 4-methoxysalicylaldehyde isonicotinoylhydrazonato ligand, are described. Polymer 1 can be quantitatively self-assembled from the n...

The hexa-, hepta- and octamolybdates as common precursors with dynamic configuration transformation in aqueous solution, have been introduced into the hydrothermal reaction system containing [CoIII(C2O4)(NH3)4]⁺ cation, leading to the isolation of four new compounds: [CoIII(C2O4)(NH3)4]3[(NH3)4CoIII(μ-C2O4)CoII(H2O)4][Mo7O24]·nH2O (n ≈ 9.25) (1), [...

Ageing a mixture of sodium molybdate, malonic acid, and tris(ethylenediamine)cobalt(III) chloride using different synthetic routes, namely, solution-based methods at room temperature or 110 °C, and a mechanochemically accelerated vapour-assisted method, yielded the polyoxomolybdate [Co(en)3]5Na[Mo7O24(μ-Mo8O26)Mo7O24]·nH2O (1). The new polyoxomolyb...

This contribution describes the synthesis, characterization and catalytic implementation of the highly constrained molybdenum(VI) polymers [MoO2(LR)]n (with R = H (1), 3OMe (2) and 4OMe (3)) and cyclic tetramer [MoO2(L4OMe)]4⸳0.5MeCN (3′⸳0.5MeCN) with nicotinoyl hydrazonato ligands (LR) derived from salicylaldehyde (LH), 3-methoxy-2-hydroxybenaldeh...

Mechanochemically accelerated vapour–assisted aging and transformation from the amorphous precipitate by aging to the crystalline products were demonstrated to be the efficient methods to synthesize crystalline hydrate and non-hydrate (poly)oxalatomolybdates, [Co(NO2)(NH3)5][MoO3(ox)H2O]·H2O, [Co(NH3)6]2[Mo4O11(ox)4(H2O)]·6H2O, [Co(NH3)6]4[Mo4O8(μ-...

The focus of this work was on synthesis, characterization and catalytic activity of Mo(VI) complexes with hemilabile polydentate ligands that show a high tendency to form discrete small-sized self-assembled structures. A series of mononuclear [MoO2(L1 or 3)(MeOH)] (1a and 3a), [MoO2(L¹)(EtOH)] (1b) and dinuclear complexes [MoO2(L¹⁻³)]2 (1-3), was s...

The cyclic dinuclear molybdenum(VI) complexes [MoO2(L¹⁻³)]2 (1, 2-α, 2-β and 3) were synthesized through the use of coordination-driven self-assembly of MoO2²⁺ core and 4-aminobenzoylhydrazone ligands (salicylaldehyde (H2L¹), 3-methoxysalicylaldehyde (H2L²), or 4-methoxysalicylaldehyde 4-aminobenzoylhydrazone (H2L³)). Their X-ray diffraction (XRD)...

The two red centrosymmetric Ni(II) tetrameric complexes with defective double-cubane core, [Ni2L2(H2O)]2·0.75 CH3OH (1) and [Ni2L2(CH3CN)]2 (2) (H2L = N-(2-hydroxy-5-methylphenyl)-salicylideneimine), have been isolated and magnetically characterized, emphasizing the effect of the reaction temperature on structural and magnetic properties of isolate...

The reaction of two methoxy substituted salinazid-based hydrazones, 4-methoxysalicylaldehyde isonicotinoyl hydrazone (L¹) and 3-methoxysalicylaldehyde isonicotinoyl hydrazone (L²) with HCl, HBr, HNO3 and H2SO4 in methanol yielded salts of different stoichiometries (1:1 or 2:1) and/or polymorphic forms. In such a way (HL¹)⁺X⁻ and (HL²)⁺X⁻ salts wher...

A series of seven tetranuclear Ni(II) cubane-like complexes of general formulae [Ni4L4(ROH)4] (1 - 3) and [Ni4L4(R1OH)x(R2OH)y] (x=y=2 for complex 6, x=1, y=3 for complexes 4, 5 and 7; R...

A systematic study of the possibility of controlling the formation of oxalatomolybdate anions by the choice of a counterion and adjustment of pH was presented. Using four CoIII(ammine) macrocations ([Co(NH3)6]³⁺, [Co(NO2)(NH3)5]²⁺, [Co(en)3]³⁺ and [Co(ox)(en)2]⁺) in acidic aqueous solutions, ten crystalline solids were obtained. They were found to...

Synthesis of hydrazones was performed via both conventional and solvent-free routes using the corresponding hydrazide (isonicotinic hydrazide, nicotinic hydrazide, 2-aminobenzhydrazide or 4-aminobenzhydrazide) and appropriate aldehyde (salicylaldehyde , 3-methoxysalicylaldehyde or 4-methoxysalicylaldehyde). A systematic study dedicated to solvatomo...

Molybdenum(VI) complexes of different nuclearity, mononuclear, [MoO2(L1 or 2)(MeOH)]·MeOH (1·MeOH and 2·MeOH), [MoO2(L1 or 2)(D)] [D = pyridine, (1a and 2a), 3-methylpyridine, (1b and 2b) and 4-methylpyridine, (1c and 2c)], binuclear [{MoO2(L1 or 2)}2(D)] (D = 4,4′-bipyridine (1d, 1d′ and 2d), and polynuclear complexes [MoO2(L1 or 2)]n (3 and 4) we...

Heteroleptic ruthenium(II) bioflavonoid complexes of quercetin, morin, chrysin and 3-hydroxyflavone were prepared and their interaction with CT DNA and BSA along with antioxidant and in vitro anticancer and antimicrobial activities was investigated. The formulation and characterization of complexes were achieved through elemental and thermal analys...

Six non−symmetric enaminones 4-[(2-hydroxy-5-methylphenyl)amino]pent-3-en-2-one (H2L¹), 4-[(2-hydroxy-4-methylphenyl)amino]pent-3-en-2-one (H2L²), 4-[(4-hydroxy-2-methylphenyl)amino)]pent-3-en-2-one (H2L³), 3-[(2-hydroxy-5-methylphenyl)amino]-1-phenylbut-2-en-1-one (H2L⁴), 3-[(2-hydroxy-4-methylphenyl)amino]-1-phenylbut-2-en-1-one (H2L⁵) and 3-[(4-...

The dinuclear copper(ii) complexes [Cu2(LH)2] (1), [Cu2(L3OMe)2] (2), [Cu2(L4OMe)2] (3) as well as the tetranuclear complex [Cu4(L3OMe)4]·4MeOH·2H2O (2a·4MeOH·2H2O), (where LH = 2-oxybenzaldehyde benzhydrazonato, L3OMe = 3-methoxy-2-oxybenzaldehyde benzhydrazonato or L4OMe = 4-methoxy-2-oxybenzaldehyde benzhydrazonato) were synthesized by reacting...

Nine Schiff base ligands derived from o-hydroxyaldehydes (2-hydroxybenzaldehyde, 2-hydroxy-3-methoxybenzaldehyde, 2-hydroxy- 1-naphthaldehyde) and nine corresponding dioxomolybdenum(vi) complexes, cis-[MoO2L(CH3OH)] or cis-[MoO2L(CH3OH)]·CH3OH and dinuclear [MoO2L]2, have been prepared using the conventional solution-based method as well as mechano...

The tetranuclear title complex, [Ni 4 (C 14 H 11 NO 2 ) 4 (CH 3 OH) 4 ]·0.8CH 3 OH, has a distorted cubane topology shaped by four Schiff base ligands. The cubane [Ni 4 (μ 3 -O 4 )] core is formed via the O atoms from the Schiff base ligands. The octahedrally coordinated Ni II ions occupy alternating vertices of the cube. Each Ni II ion is coordina...

A series of copper(ii) complexes with 4-hydroxybenzhydrazone-related ligands was synthesized by using various methods, including the conventional solution-based method, solvothermal route and electrochemical synthesis. The complexes can be classified as mononuclear [Cu(L3OMe)(py)] (2py), dinuclear [Cu2(LH)2(py)2] (1py), [Cu2(LH)2] (1α and 1β), [Cu2...

Based on a new family of NiII cubane-like clusters, this work addresses current challenges in the synthesis, analysis and dynamics of single-molecule-magnet (SMM) systems. Investigation of various synthetic routes and desorption-sorption processes yielded a series of isomorphous compounds: [Ni4L4(CH3OH)4]·xsolv, [Ni4L4(CH3OH)4] and [Ni4L4]. In orde...

To the best of our knowledge there are no described efforts on preparation of ruthenium complexes with naturally occurring flavonoids like quercetin. For the first time we investigated synthetic approaches to ruthenium – quercetin complexes and studied their reactivity towards CT DNA and antioxidant activity. Effect of starting Ru compound, solvent...

Synthesis of the dioxidomolybdenum(VI) complexes [MoO2(HLR)(MeOH)]Cl (1-3) was carried out by using MoO2Cl2 and the corresponding ONO aroylhydrazone ligand H2LR (ligand H2LR is salicylaldehyde isonicotinoylhydrazone (H2LSIH), 2-hydroxy-naphthaldehyde isonicotinoylhydrazone (H2LNIH), or p-(N,N′-diethylamino)salicylaldehyde isonicotinoylhydrazone (H2...

Cobalt(iii) complexes of the type [Co(HL)(L)] were synthesized under solvothermal conditions staring from [Co(C5H7O2)3] and the corresponding ligand H2L (salicylaldehyde 4-hydroxybenzhydrazone, 3-methoxysalicylaldehyde 4-hydroxybenzhydrazone, 4-methoxysalicylaldehyde 4-hydroxybenzhydrazone, salicylaldehyde benzhydrazone, 3-methoxysalicylaldehyde be...

This work presents a successful application of a recently reported supramolecular strategy for stabilization of metastable tautomers in cocrystals to monocomponent, non-heterocyclic, tautomeric solids. Quantum-chemical computations and solution studies show that the investigated Schiff base molecule, derived from 3-methoxysalicylaldehyde and 2-amin...

Supramolecular stabilization of tautomers: The investigated Schiff base is far more stable as the enol tautomer as shown by quantum-chemistry computations and spectroscopic studies in solution. In the solid state, however, in all obtained polymorphs or cocrystalline forms, it exists solely as the metastable keto tautomer. The stabilization of the m...

Mononuklearni kompleksni spojevi molibdena(VI) priređeni su reakcijom [MoO2(acac)2] i hidrazona, tridentatnih liganada koji uz C=N dvostruku vezu sadrže i N-N jednostruku vezu. Hidrazoni se stabiliziraju kroz ketoamino-enolimino tautomeriju, a strukturna istraživanja su pokazala postojanje obje forme u kompleksnim spojevima. Ispitivanja su takođ...

Mononuclear and polynuclear dioxomolybdenum(VI) complexes with the tridentate Schiff base ligand have been prepared by the reaction of [MoO2(acac)(2)] with N-4-methoxysalicylidene-2-amino-3-hydroxyPYridine (H2L, 1) in methanol, ethanol or acetonitrile. All the prepared complexes of the general formulae [MoO2L(ROH)], [MoO2LD], ([MoO2L](2)D'}center d...

Eight mononuclear [Ni(sal 4-Phtsc)center dot D] thiosemicarbazonato complexes [sal4-Phtsc = salicylaldehyde 4-phenylthiosemicarbazonato ligand; D = imidazole (1), methylimidazole (2), pyridine (3), 4-aminopyridine (4), 4-methylpyridine (6), morpholine (7), thiomorpholine (8), 2-aminophenol (9)] and one dinuclear {[Ni(sal 4-Phtsc)](2)center dot D} c...

Reactions of salicylaldehyde 4-methylthiosemicarbazone (H2L1) and salicylaldehyde 4-phenylthiosemicarbazone (H2L2) with assorted chromium(III) precusors, [Cr(H2O)(6)]Cl-3, [Cr(H2O)(6)](NO3)(3)center dot 3H(2)O and [Cr(H2O)(6)](CH3COO)(3), afforded new mononuclear chromium(III) complexes of the general formula [Cr(HL)(2)]X (X = Cl-, NO3- and CH3COO-...

In the synthesis of Ni(II) salicylaldehyde 4-phenyl and 4-methyl-thiosemicarbazonato complexes conventional, electrochemical and mechanochemical routes were applied and compared. Polynuclear tetrahedral [Ni(sal 4-Metsc)]n (1) and mononuclear square planar [Ni(sal 4-Phtsc)(H2sal 4-Phtsc)]·CH3OH (2) were obtained by the conventional method. The elect...

New alkoxooxovanadium(V) complexes, [VO(L)(OR)] (OR = OMe (1), OEt (2), OPr (3)), were synthesized by the reaction of assorted vanadium precursors and 4-methoxysalicylaldehyde 4-phenylthiosemicarbazone (H2L) in appropriate alcohols. Complexes 2 and 3 crystallized each in two polymorphic forms, which can be selectively prepared by using either a van...

The binding properties and conformational adaptability of a known nitrate/sulfate receptor N,N'-3-azapentane-1,5-bis[3-(1-aminoethylidene)-6-methyl-3H-pyran-2,4-dione] (L) toward various charge-dispersed monoanions (HSO(3)(-), ClO(4)(-), IO(4)(-), PF(6)(-), and SbF(6)(-)) are considered. These anions template the folding of three HL(+) species thro...

Several phenylenediamine derivatives of dehydroacetic acid, 3-acetyl-4-hydroxy-6-methyl-2H-pyran-2-one have been synthesized and their structure elucidated by using NMR and IR spectroscopies and mass spectrometry. Spectral analyses have pointed toward the localized keto-amine form as the predominant tautomeric form in solution and solid-state which...

This article describes the selective cleavage of coordination bonds by mechanochemical methods and the further application of the thus obtained precursors for a facile preparation of new coordination compounds. In the class of dioxomolybdenum(VI) coordination compounds, [MoO2L(ROH)], where L stands for a tridentate dianionic ONO ligand and ROH repr...

Reactions of first series transition-metal cations, Cd(II) and Al(III) with two aroylhydrazones derived from nicotinic acid hydrazide and salicylaldehyde or o-vanillin were studied at 25°C in buffered dioxane/water 1/1 mixture (pH 5.8) by means of spectrophotometric and spectrofluorimetric titrations. The addition of Mn(II) or Cd(II) ions in hydraz...

Reaction of dehydroacetic acid and p-phenylenediamine afforded a monosubstituted Schiff base, I, with the other amino group free. In further reactions with various salicylaldehyde derivatives, I served as a precursor for synthesis of asymmetric bis-Schiff bases. The synthesized compounds are thus comprised of two subunits, dehydroacetic (dha) and s...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The first structurally characterised oxomolybdenum(V) complexes with thienyl carboxylate ligands were prepared by the reaction of [Mo2O3(C5H7O2)4] or (NH4)2[MoOCl5] with the corresponding acid (2-thiophenecarboxylic, 5-methyl-2-thiophenecarboxylic or 3-(3-thienyl)acrylic acid). Complexes [Mo2O3(μ-OC2H5)(μ-O2CR)(C5H7O2)2](R=–C4H3S (1), –C4H2S(CH3) (...

Nanoparticles of iron boride (Fe2B, Fe2B coated in SiO2, FexCo2−xB coated in SiO2) were synthesized using the reduction of metal ions by sodium borohydride. X-ray diffraction confirms the amorphicity of the coated compounds and scanning electron microscope imaging revealed the nanoparticulated structure of all compounds. The splitting between zero-...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The title compound, [MoO2(L)(CH3OH)], crystallizes as a concomitant conformational trimorph. The occurrence domains, under which these forms can be prepared, separated, and/or interconverted, were explored and determined in terms of the crystallization conditions and solid-state reactions. Solvent-free reactions resulted in dissociation of coordina...

Reactions of the salicylaldehyde 4-phenylthiosemicarbazone (H(2)L) with selected vanadium(iv) and vanadium(v) precursors ([VO(acac)(2)], [VO(OAc)(2)], VOSO(4), [V(2)O(4)(acac)(2)]) were investigated under aerobic conditions in different alcohols (methanol, ethanol, propanol). In all examined cases mononuclear alkoxo vanadium(v) complexes [VOL(OR)]...

New dioxomolybdenum(VI) complexes were obtained by the reaction of [MoO2(acac)2] with thiosemicarbazone ligands derived from 3-thiosemicarbazide and 4-(diethylamino)salicylaldehyde (H2L1), 2-hydroxy-3-methoxybenzaldehyde (H2L2) or 2-hydroxy-1-naphthaldehyde (H2L3). In all complexes thiosemicarbazonato ligands are coordinated to molybdenum as triden...

Abstract Red crystals of cis-dioxo(3-methoxysalicylaldehyde 4-methylthiosemicarbazonato-N,O,S)(γ-picoline-N)molybdenum(VI), [MoO2L(γ-pic)], [L2−=CH3OC6H4(O)CH=NN=C(S)NHCH3, 3-methoxysalicylaldehyde 4-methylthiosemicarbazonato] were prepared by the reaction of [MoO2L] n with γ-picoline in dry methanol. The title compound crystallized in the monoclin...

Flexible anion receptors draw significant scientific attention in the last few decades.[1] Although they usually display lower binding constants than rigid hosts, many interesting features are connected with this class of compounds. Binding to anion often includes extreme spatial rearrangements of the flexible host. Such movement provides valuable...

The authors' review compiles the literature in the field of polyoxomolybdates, POMo, and polyoxomolybdovanadates, POMoV, over the past two decades. The main achievements in the field of synthesis, crystal and molecular structure determinations and applications are presented. The first section describes polyoxomolybdates; their structure starting wi...

New dinuclear pentacoordinate molybdenum(V) complexes, [Mo 2 V O 3 L 2 ] [L = thiosemicarbazonato ligand: C 6 H 4 (O)CH:NN:C(S)NH R ′ and C 10 H 6 (O)CH:NN:C(S)NH R ′; R ′ = H, CH 3 , C 6 H 5 ) were obtained either by oxygen atom abstraction from Mo VI O 2 L with triphenylphosphine or by using [Mo 2 O 3 (acac) 4 ] in the reaction with the correspon...

Eight new molybdenum(VI) complexes with 4-(diethylamino)salicylaldehyde and 2-hydroxy-3-methoxybenzaldehyde thiosemicarbazones have been prepared. They were characterized as mononuclear [MoO2LD] or dinuclear [{MoO2L}2D] complexes. In all the compounds the MoO22+ core is coordinated by a tridentate ONS thiosemicarbazonato ligand and by the N-donor m...

The molybdenum(VI) complexes [Mo2O4(C6H4(O)CHNCH(COO)CH2CONH2)2] (1), [MoO2(C6H4(O)CHNCH(COO)CH2C(O)NH2)] (3) and [MoO2(C19H19N2O5)(CH3OH)]Cl · CH3OH (4), of salicylaldehyde amino acid derivatives (dl-asparagine or l-ornithine hydrochloride) have been synthesized and characterized. The Schiff base containing a saturated heterocyclic ring (in comple...

The molecular structures of two salicylaldehyde thiosemicarbazone derivatives, namely salicylaldehyde 4-phenylthiosemicarbazone, C(14)H(13)N(3)OS, (I), and 4-methoxysalicylaldehyde 4-phenylthiosemicarbazone, C(15)H(15)N(3)O(2)S, (II), both of potential pharmacological interest, are found in the keto (thione) tautomeric form. The first compound repr...

(Figure Presented) One ring to rule them out: Preorganization of simple polyamine podands in the presence of nitrate or sulfate affords a new kind of C3-symmetrical supramolecular ring. Although not rigid, the ring's cavity is stabilized by a network of noncovalent interactions and displays an amazing level of selectivity for these two anions in a...

The paper describes synthesis of several novel thiosemicarbazone derivatives. Furthermore, crystal and molecular structure of 4-diethylamino-salicylaldehyde 4-phenylthiosemicarbazone revealed planarity of conjugated aromatic system, which suggested the possibility of DNA binding by intercalation, especially for here studied naphthalene derivatives....

New title complex has been synthesized by the reaction of salicylaldehyde 4-phenylthiosemicarbazone with 4-methylp- yridine-N-oxide and (VO(acac)2).The tetragonal pyramidal coordination about vanadium atom is realized through O,N,S-donors of a doubly deprotonated thiosemicarbazonato ligand, oxygen atom from 4-methylpyridine-N-oxide mo- lecule and i...

New molybdenum(VI) complexes have been prepared by the reaction of [MoO2(acac)2] (acac = acetylacetonate ion) with the thiosemicarbazone ligands derived from dehydroacetic acid and thiosemicarbazide (H2L1) or 4-phenylthiosemicarbazide (H2L 2). All complexes consist of the MoO22+ core with molybdenum coordinated by ligand L via three donor atoms: py...

The structure of salicylaldehyde-4-phenylthiosemicarbazone (1) has been studied by using NMR and DFT methods. It was demonstrated that in DMSO-d 6 and CD2Cl2 solution the molecule existed in the hydroxy-thione tautomeric form and that there was no proton transfer at ambient temperature. There was not a conclusive evidence for the thiol form althoug...

In the reaction of tris(2,4-pentandionato)vanadium(III) with salicylaldehyde 4-phenylthiosemicarbazone (H2L1) and 3-methoxysalicylaldehyde 4-phenylthiosemicarbazone (H2L2), two new mononuclear complexes of vanadium(V), [VOL1(OCH 3)] (1) and [VOL2(OCH3)] (3), as well as thiazoline derivatives, {R-CHNN[CNC(C6H5)C(CH 3)C(O)(CH3)S]} [R = -C6H4(OH) (Lcy...

Mononuclear oxomolybdenum(V) complexes with thiosemicarbazonato ligands as condensation products of aldehydes (salicylaldehyde, 2-hydroxynaphthaldehyde) with thiosemicarbazides (H2NNHC:SNHR; R = H, CH3, C6H5) were prepared. The [MoOCl2HL] complexes (HL = thiosemicarbazonato ligand) were characterized by chemical analysis, IR spectroscopy, thermogra...

Mononuclear oxomolybdenum(V) complexes with thiosemicarbazonato ligands as condensation products of aldehydes (salicylaldehyde, 2-hydroxynaphthaldehyde) with thiosemicarbazides (H2NNHC:SNHR; R = H, CH3, C6H5) were prepared. The [MoOCl2HL] complexes (HL = thiosemicarbazonato ligand) were characterized by chemical analysis, IR spectroscopy, thermogra...

Mononuclear oxomolybdenum(V) complexes with thiosemicarbazonato ligands as condensation products of aldehydes (salicylaldehyde, 2-hydroxynaphthaldehyde) with thiosemicarbazides (H2NNHC:SNHR; R = H, CH3, C6H5) were prepared. The [MoOCl2HL] complexes (HL = thiosemicarbazonato ligand) were characterized by chemical analysis, IR spectroscopy, thermogra...

γ-Type octamolybdates of the formulae, Na4[Mo8O26(alaO)2]·18H2O (I), Na4[Mo8O26(glyglyO)2]·15H2O (II) and Na4[Mo8O26(glyglyO)2]·12H2O (III) have been prepared from sodium molybdate in aqueous solution by adding dl-alanine or glycylglycine. Their crystal structures have been determined by X-ray structure analysis. dl-alanine and glycylglycine coordi...

Polynuclear [MoO2{SalTSC-4-Me}]n (I), [MoO2{VanTSC-4-Me}]n (II) and mononuclear [MoO2{SalTSC-4-Me}(CH3OH)] (1a), [MoO2{VanTSC-4-Me}(CH3OH)] (2a) and [MoO2{VanTSC-4-Me}(H2O)] · CH3CN (2b) complexes have been prepared by the reaction of the [MoO2(acac)2] (acetylacetonate ligand, acac-, C5H7O2-) with 1 (salicylaldehyde 4-methylthiosemicarbazone ligand...

Two macrocyclic ligands, N,N′-propylene-diylbis[3-(1-aminoethyl)-6-methyl-2H-pyran-2,4(3H)-dione] I and N,N′-phenylene-diylbis[3-(1-aminoethyl)-6-methyl-2H-pyran-2,4(3H)-dione] II, have been prepared by the condensation of dehydroacetic acid (3-acetyl-4-hydroxy-6-methyl-2H-pyran-2-one) with 1,2-phenylenediamine and 1,3-propylenediamine. They have b...

New dioxomolybdenum(VI) complexes were obtained by the reaction of [MoO2(acac)2] with 4-phenylthiosemicarbazone ligands derived from salicylaldehyde, 2-hydroxy-1-naphthaldehyde, 2-hydroxy-3-methoxybenzaldehyde or from 4-(diethylamino)salicylaldehyde. In all complexes the ligands are coordinated to molybdenum as tridentate ONS-donors through phenoli...

Mononuclear molybdenum(VI) complexes of the type [MoO2{C6H4(O)CH:NNC(S)NH2}(D)] [D=pyridine (1d), γ-picoline (1c)] and [MoO2{C6H4(O)CH:NNHC(S)NH} (CH3OH)]·CH3OH·1/2bpy (1e) have been prepared by the reaction of [MoO2(C5H7O2)2] (C5H7O2=acetylacetonate ion) with salicylaldehyde thiosemicarbazone [C6H4(OH)CH:NNC(SH)NH2] and Lewis base in dry methanol....

Two enaminones ethyl 4-(4-hydroxy-6-methyl-2H-pyran-2-on-3-yl)-2-(tryptamino)-4-oxo-2-butenoate (HL1) and 3-(1-tryptaminoetylidene)-6-methyl-2H-pyran-2,4(3H)-dione (HL2) have been prepared by the reactions of tryptamine with 2-hydroxy-4-(4-hydroxy)-6-methyl)-2Hbb-pyrane-2-on-3-yl)-4-oxo-2-butenoate (ehmpb) or with dehydroacetic acid (dha). The NMR...

Mononuclear molybdenum(VI) [MoO2L2] (1a, 1b, 2a, 2b) and dinuclear molybdenum(V) [Mo2O4(L1b)2(CH3OH)2] (3b) complexes have been prepared by the reaction of [MoO2(acac)2] or [Mo2O3(acac)4] (acac=acetylacetonate ion), respectively, with the appropriate β′-hydroxy-β-enaminones (HL). Also, two isomeric enaminones (HL1a and HL1b) have been prepared by t...

Mononuclear [MoO2LD], and dinuclear [MoO2L]2 or [MoO2L]2 · D dixomolybdenum(VI) complexes have been prepared by the reaction of tridentate Schiff-base ligands L with [MoO2(acac)2]. The Schiff-base ligands have been synthesized from salicylaldehyde (1, 1a, 1c, 1d), 2-hydroxy-1-naphthaldehyde (2, 2c) and 2-hydroxy-3-methoxybenzaldehyde (3a, 3b, 3c, 3...

Six new dinuclear complexes of molybdenum(V) have been prepared by the reaction of [Mo2O3(acac)4] (acac=acetylacetonate ion) with the polydentate ligands, β′-hydroxy-β-enaminones. The complexes are coordinated by two enaminone ligands via two donor oxygen atoms as in the analogous β-diketonates. The octahedral coordinations around the molybdenum at...

The synthesis of two monomeric molybdenum(VI) Schiff base complexes derived from N-phenyl-2-hidroxy-1-naphthaldimine and N-benzyl-2-hidroxy-1- naphthaldimine: [MoO2(C5H7O2) (OCH3)(2-OC10H6CH=NHC6H 5)] (I) and [MoO2(C5H7O 2)(OCH3)(2-OC10H6CH=NHCH 2C6H5)] (II) described in this paper are the first examples in which potentially bidentate Schiff bases...

Mononuclear and polynuclear dioxomolybdenum(VI) complexes with Schiff base ligands have been prepared by the reaction of [MoO2(acac)2] with salicylaldehyde (1 and 4), 2-hydroxy-1-naphthaldehyde (2 and 5) and 2-hydroxy-3-methoxybenzaldehyde (3 and 6) with addition of appropriate amine. All prepared complexes of the general formulae [MoO2LD] and [MoO...

Tetrakis(methyl-2-mercaptonicotinato-N,S,N′,S′,N′′,S′′,N′′′,S′′′)molybdenum(IV), has been obtained by the reaction of [MoCl2(acac)2] (or MoCl4·2CH3CN) and 2-mercaptonicotinic acid in methanol. Esterification of 2-mercaptonicotinic acid resulted from the catalytic action of molybdenum. The complex molecule contains molybdenum dodecahedraly coordinat...

New dinuclear molybdenum(V) complexes of the general formula [Mo2O4L2D2], were prepared by the reaction of [Mo2O3(acac)4] (acac = acetylacetonate ion) with β′-hydroxy-β-enaminones (L). All prepared complexes consist of Mo2O42+ cores coordinated by two ligands L via two donor oxygen atoms as in the analogous β-diketonates. The usual octahedral coord...