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Journal of Spectroscopy
Volume 2013, Article ID 470427, 7 pages
Research Article

Effect of Counterion on the Solvatochromic Properties of Heteroleptic Chelate Copper(II) Complexes

Department of Inorganic Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran

Received 24 June 2012; Revised 26 July 2012; Accepted 4 August 2012

Academic Editor: K.S.V. Krishna Rao

Copyright © 2013 Hamid Golchoubian and Hakimeh Fazilati. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A series of heteroleptic chelate copper(II) complexes of the type [Cu(L)(acac)]X where acac = acetylacetonate; L = N,N′-1,6-bis(2-fluorophenyl)-2,5-diazahexane; X=CIO4, BPh4, PF6, and BF4 have been prepared and characterized by elemental analyses, IR and UV-Vis spectroscopies, and molar conductance measurements. The prepared complexes are fairly soluble in a large number of organic solvents and show positive solvatochromism. Among the complexes [Cu(L)(acac)]ClO4, it is demonstrated the most solvatochromism. A multiparametric equation has been utilized to explain the solvent effect on the d-d transition of the complexes using SPSS/PC software. To explore the mechanism of interaction between solvent molecules and the complexes, different solvent parameters such as DN, AN, α, 𝐸𝑇(30), 𝜋, and β using stepwise multiple linear regression (SMLR) method were employed. The results demonstrated that the donor power of the solvent plays the most important role in the solvatochromism of the compounds.