6533b873fe1ef96bd12d5f78

RESEARCH PRODUCT

Copper(II) complexes with 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone

Martin BrezaPeter RaptaEva RentschlerSergiu ShovaLuca M. CarrellaVladimir B. ArionÉVa A. EnyedyAnatolie DobrovDiana Dragancea

subject

Schiff basemedicine.diagnostic_testLigandStereochemistryInfrared spectroscopychemistry.chemical_elementMagnetic susceptibilityCopperInorganic Chemistrychemistry.chemical_compoundCrystallographyDeprotonationchemistrySpectrophotometryMaterials ChemistrymedicinePhysical and Theoretical ChemistryCyclic voltammetry

description

Abstract The acid–base properties of 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone (H4L) and its thioanalogue 1,5-bis(2-hydroxybenzaldehyde)thiocarbohydrazone (H4LS) have been studied experimentally by pH-potentiometry and UV–Vis spectrophotometry and theoretically by using DFT methods. Copper(II) complexes [Cu2(HL)(DMSO)2(H2O)]NO3·H2O (1), [{Cu2(HL)(DMF)(H2O)}n][{Cu2(HL)(DMF)NO3}n](NO3)n (2), [Cu2(HL)(DMF)2(H2O)]HSO4·H2O (3), [Cu2(HL)(DMF)2(H2O)][Cu2(HL)(SO4)(H2O)(DMF)2]·2H2O (4) and [Cu4(HL)2(HSO4)(DMF)2]HSO4 (5), where H4L = 1,5-bis(2-hydroxybenzaldehyde)carbohydrazone, have been synthesised. Complexes 1–3 have been characterised by elemental analysis, IR spectroscopy, ESI mass spectrometry, cyclic voltammetry, magnetic susceptibility measurements and X-ray diffraction, while 4 and 5 only by X-ray crystallography. X-ray diffraction revealed that the ditopic triply deprotonated ligand possesses two binding sites able to accommodate transition metal ions, namely ONN and ONO. Magnetic measurements showed antiferromagnetic interactions between copper(II) centres.

yearjournalcountryeditionlanguage
2014-09-01Polyhedron
https://doi.org/10.1016/j.poly.2014.03.039