Effect of ligand substituents on supramolecular self-assembly and electrochemical properties of copper(II) complexes with benzoylhydrazones: X-ray crystal structures and cyclic voltammetry

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• 作者：Dariusz Matoga ; ^{matoga@chemia.uj.edu.pl} ; Janusz Szklarzewicz ; Wojciech Nitek
• 关键词：Copper ; Complex ; Hydrazone ; Supramolecular ; Substituent ; Voltammetry
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：4 April, 2012
• 卷：36
• 期：1
• 页码：120-126
• 文件大小：920 K

摘要

Complexation of copper(II) with a series of hetero-donor chelating Schiff bases (HLL^R) of para-substituted benzhydrazides (with R = OH, NO₂, CH₃O, Cl and tert-butyl substituents) and acetone affords mononuclear [Cu(LL^R)₂] molecules: 1 [Cu(anbhz)₂] (R = NO₂); 2 [Cu(ahbhz)₂] (R = OH) 3 [Cu(ambhz)₂] (R = CH₃O); 4 [Cu(acbhz)₂] (R = Cl); and 5 [Cu(atbhz)₂] (R = tert-butyl). Single-crystal X-ray diffraction results for 2-5 reveal their various supramolecular architectures including 1D and 2D dimensionalities. A detailed analysis of crystal structures allows to gain insight into intermolecular interactions accountable for self-assembly into different networks as well as for various physicochemical properties of the compounds. The major interactions include O-H鈰疦 hydrogen bonds (2) as well as CH鈰疦 and axial Cu鈰疧 (3); 蟺鈰€ stacking (4) and van der Waals CH鈰疌 interactions (5). All compounds are characterized by elemental analyses; IR and UV-Vis spectroscopy as well as magnetic susceptibility and cyclic voltammetry measurements. Electrochemical studies reveal the dependence of [Cu(LL^R)₂]/[Cu(LL^R)₂]^{鈭?/sup> reduction potentials on substituents of benzoylhydrazonoate ligands.}