Syntheses of dinuclear copper(II) complexes containing of tertiary diamine and amido groups with hydroxo bridges; chromotropic properties
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- 作者：Hamid Golchoubian ; Asieh Heidarain ; Ehsan Rezaee ; Francesco Nicol貌
- 关键词：Chromotropism ; Tertiary diamine ; Copper(II) complex ; Diamine ligand ; Dinuclear complex ; Amide ligand
- 刊名：Dyes and Pigments
- 出版年：May, 2014
- 年：2014
- 卷：104
- 期：Complete
- 页码：175-184
- 全文大小：2479 K
文摘
Two new symmetric dinuclear complexes type [Cu(L)(渭-OH)]2(ClO4)2, where either L聽=聽N,N-dimethyl,N鈥?3-propylamide-ethylenediamine or N,N-diethyl,N鈥?3-propylamide-ethylenediamine were synthesized and characterized on the basis of elemental analysis, conductance measurement, spectroscopic techniques and X-ray crystal analysis. The complexes show halochromism in aqueous solution. The pH effects on the visible absorption spectra of the two complexes were studied which act as pH-induced 鈥渙ff-on-off鈥?switches through protonation and deprotonation in aqueous solution at room temperature. The dinuclear complexes were also observed to exhibit thermochromism, solvatochromism and ionochromism as a result of hemilability of amide groups. The solvatochromism of the complexes was investigated with different solvent parameter models using stepwise multiple linear regression method. The results suggested that the donor number parameter of the solvent has a dominant contribution to the shift of the d-d absorption band of the complexes.