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A spectroscopic study of solvent effects on the formation of Cu(ii)-chloride complexes in aqueous solution
Ning Zhang1, Jianfeng Tang, Yuntian Ma
1College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan, P. R. China. ningcheung@hotmail.com.
Abstract:
A combination of electronic (UV-vis) and X-ray absorption (EXAFS, XANES) spectroscopies has been used to investigate the formation of copper(ii)/chloride complexes in concentrated aqueous solutions. It is established that lowering the water activity by the addition of Mg(ClO4)2 at a constant Cl-/Cu(ii) ratio results in the replacement of water molecules by Cl- ions in the primary coordination shell of Cu(ii). This behavior closely parallels the effect of increasing the Cl-/Cu(ii) ratio and demonstrates that full understanding of the stoichiometry and structures of the complexes formed in concentrated metal-ion chloride solutions requires explicit consideration of the role of the solvent.
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