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New insight on the local structure of Cu2+ ion in the solution of CuBr2 by EXAFS studies

Meijuan Yu1, Wangsheng Chu1, Xing Chen1 and Ziyu Wu1,2,3

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CuBr2 solutions at different concentrations were studied by extended X-ray absorption fine structure (EXAFS) at the Cu K edge. In the saturated solution Cu2+ ions have chemical bonds with 3.0 oxygen atoms and 0.9 Br ion at about 1.96 Å and 2.42 Å, respectively. It indicates that the CuBr4-2 configuration exists with a ratio of 25% under this condition. In the dilute solutions no evidence of Br ions contributions in the first shell around Cu2+ ions occurs. The almost identical X-ray absorption near edge structure (XANES) and EXAFS characters address similar local environments around Cu2+ in agreement with results of the EXAFS fit taking into account only the contributions of Cu-O bonds.


PACS

78.70.Dm X-ray absorption spectra

82.45.Gj Electrolytes

61.25.-f Studies of specific liquid structures

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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