Danilescu Olga

Institute of Chemistry, R. Moldova, Chisinau · Coordination Chemistry

A new molecular binuclear vanadium(V) complex [VO(L)(OCH3)]2 (I) is synthesized in which ligand H2L is prepared by the reaction of isonicotinic acid hydrazide (INAH, isoniazide) with 1-phenyl-1,3-butanedione. Ligand H2L and complex I are studied by elemental analysis, IR spectroscopy, mass spectrometry, and X-ray diffraction (XRD) (CIF files CCDC n...

A new molecular binuclear vanadium(V) complex [VO(L)(OCH3)]2 (I) is synthesized in which ligand H2L is prepared by the reaction of isonicotinic acid hydrazide (INAH, isoniazide) with 1-phenyl-1,3-butanedione. Ligand H2L and complex I are studied by elemental analysis, IR spectroscopy, mass spectrometry, and X-ray diffraction (XRD) (CIF files CCDC n...

Six new iron coordination complexes were obtained as a result of the direct interaction of the Fe³⁺ ion and Schiff base ligands in the presence of anions with weak, moderate and high coordinating ability in order to study their role in the construction of diverse supramolecular assemblies. All the crystalline solids present mononuclear complexes: [...

Hydrazones (R1R2C=NNR2R4) represent a class of organic ligands capable to coordinate with diverse metal centers generating varied molecular architectures. The Schiff base with the hydrazone fragment provide a good platform for generating a verity of new ligands their metal complexes with promising chemical, physical, biological properties useful fo...

Coordination polymers (CPs) are an attractive area of research in coordination chemistry and crystal engineering due to their intriguing topological architectures and various applications. Schiff bases derived from 2,6-diacetylpyridine are suitable candidates for the development of magnetic homo-and/or heterometallic CPs. Herein, we present our met...

Four Mn(II) coordination compounds based on the 2,6-diacetylpyridine bis(isonicotinoylhydrazone) (H2L¹) and 2,6-diacetylpyridine bis(nicotinoylhydrazone) (H2L²), were prepared using different synthetic conditions and starting manganese salts: discrete mononuclear [Mn(H2L¹)2(H2O)2](NO3)2 (1) and trinuclear [Mn3(H2L¹)2(NCS)2Cl4(H2O)2] (2) complexes a...

Based on solvothermal synthesis, self-assembly of the heptadentate 2,6-diacetylpyridine bis(nicotinoylhydrazone) Schiff base ligand (H2L) and Zn(II) and/or Cd(II) salts has led to the formation of three homometallic [CdL]n (1), {[CdL]∙0.5dmf∙H2O}n (2) and {[ZnL]∙0.5dmf∙1.5H2O}n (3), as well as two heterometallic {[Zn0.75Cd1.25L2]∙dmf∙0.5H2O}n (4) a...

Seven new cobalt(II) complexes based on the Schiff bases, 2,6-diacetylpyridine bis(isonicotinoylhydrazone) (H2L¹) and 2,6-diacetylpyridine bis(nicotinoylhydrazone) (H2L²), are synthesized and studied by X-ray diffraction analysis: [Co(H2L¹)(NCS)2] · 2.25H2O (I), [Co(H2L²)(NCS)2] · CH3OH (II), [Co(H2L²)(NCS)(H2O)]NCS (III), [Co(H4L¹)(NCS)2](NO3)2 ·...

Four coordination compounds of iron(III) with ligands based on hydrazine and sulfadiazine: [Fe(dig)]Cl3·2H2O (I) (dig-semicarbazide diacetic acid dihydrazide), [Fe(HL)SO4] (II) (HL - sulfadiazine), [Fe(H2L¹)(H2O)2](NO3)3·5H2O (III) (H2L¹-2,6-diacetylpyridine bis(nicotinoylhydrazone) and [Fe(H2L²)(H2O)2](NO3)3·1.5H2O (IV) (H2L² - 2,6-diacetylpyridin...

A reaction between VOSO4, 2,6-diacetylpyridine, and nicotinohydrazide in a molar ratio of 1: 1: 2 afforded two complexes differing in both color and crystal shape as well as in chemical composition and molecular structure. The compositions and structures of the vanadium complexes were determined by IR spectroscopy and X-ray diffraction (CIF files C...