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

Dragancea, Diana and Shova, Sergiu and Enyedy, Éva Anna and Breza, Martin and Rapta, Peter and Carrella, Luca M. and Rentschler, Eva and Dobrov, Anatolie and Arion, Vladimir B. (2014) Copper(II) complexes with 1,5-bis(2-hydroxybenzaldehyde) carbohydrazone. POLYHEDRON, 80. pp. 180-192. ISSN 0277-5387

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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.

Item Type: Article
Uncontrolled Keywords: Copper(II) Magnetic properties Carbohydrazone Thiocarbohydrazone Schiff base
Subjects: Q Science / természettudomány > QD Chemistry / kémia
Depositing User: MTMT SWORD
Date Deposited: 15 May 2014 07:37
Last Modified: 18 May 2016 10:38

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