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Synthesis, structure and solvatochromism studies on copper(II) complexes containing ethylenediamine, pyridine and imidazol ligands

Golchoubian, Hamid, Nazari, Omeleila and Kariuki, Benson 2011. Synthesis, structure and solvatochromism studies on copper(II) complexes containing ethylenediamine, pyridine and imidazol ligands. Journal of the Chinese Chemical Society 58 (1) , pp. 60-68. 10.1002/jccs.201190059

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Abstract

Two copper(II) complexes type [Cu(en)X2](ClO4)2, where en = ethylenediamine and X = pyridine, 1 or imidazol, 2 have been synthesized and prepared on the bases of elemental analysis, spectroscopic and molar conductance measurements. The X-ray crystal analysis of these complexes demonstrated Two copper(II) complexes type [Cu(en)X2](ClO4)2, where en = ethylenediamine and X = pyridine, 1 or imidazol, 2 have been synthesized and prepared on the bases of elemental analysis, spectroscopic and molar conductance measurements. The X-ray crystal analysis of these complexes demonstrated that the copper(II) ions are in square planar environments through coordination by two nitrogen atoms of the ethylenediamine and two nitrogen atoms of two pyridine or imidazol molecules and the ClO4- ions are bound weakly above and below of the molecular plane. The complexes show three ions behavior in all solvents. The complexes are soluble in various solvents and are solvatochromic. The solvatochromism of the complexes were investigated by UV-Vis spectroscopy with different solvent parameters such as DN, AN, and β using multiple linear regression (MLR) method. The results suggested that the DN parameter of the solvent has the most contribution to the shift of the d-d absorption band of the complex 1 but in complex 2 the DN and β have almost similar importance in the observed variation in the shift of the νmax values with solvent nature. that the copper(II) ions are in square planar environments through coordination by two nitrogen atoms of the ethylenediamine and two nitrogen atoms of two pyridine or imidazol molecules and the ClO4- ions are bound weakly above and below of the molecular plane. The complexes show three ions behavior in all solvents. The complexes are soluble in various solvents and are solvatochromic. The solvatochromism of the complexes were investigated by UV-Vis spectroscopy with different solvent parameters such as DN, AN, and β using multiple linear regression (MLR) method. The results suggested that the DN parameter of the solvent has the most contribution to the shift of the d-d absorption band of the complex 1 but in complex 2 the DN and β have almost similar importance in the observed variation in the shift of the νmax values with solvent nature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Solvatochromism; Backward multiple linear regression; Crystal structure; Copper(II) complex; Imidazol; Pyridine
Publisher: The Chemical Society (Taipei) & Wiley-VCH
ISSN: 0009-4536
Last Modified: 04 Jun 2017 03:18
URI: http://orca-mwe.cf.ac.uk/id/eprint/19591

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