Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2012-01-01

Spectroscopic studies on Solvatochromism of mixed-chelate copper(II) complexes using MLR technique

Hamid Golchoubian, Golasa Moayyedi, Hakimeh Fazilati, Hamid Golchoubian, Golasa Moayyedi, Hakimeh Fazilati

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 85(1) , 25-30, (2012)

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Abstract

Mixed-chelate copper(II) complexes with a general formula [Cu(acac)(diamine)]X where acac=acetylacetonate ion, diamine=N,N-dimethyl,N'-benzyl-1,2-diaminoethane and X=BPh(4)(-), PF(6)(-), ClO(4)(-) and BF(4)(-) have been prepared. The complexes were characterized on the basis of elemental analysis, molar conductance, UV-vis and IR spectroscopies. The complexes are solvatochromic and their solvatochromism were investigated by visible spectroscopy. All complexes demonstrated the positive solvatochromism and among the complexes [Cu(acac)(diamine)]BPh(4)·H(2)O showed the highest Δν(max) value. To explore the mechanism of interaction between solvent molecules and the complexes, different solvent parameters such as DN, AN, α and β using multiple linear regression (MLR) method were employed. The statistical results suggested that the DN parameter of the solvent plays a dominate contribution to the shift of the d-d absorption band of the complexes.Copyright © 2011 Elsevier B.V. All rights reserved.