Yan Pan, Li-yun Zhang, Yang-zhong Liu. XAFS Study of Coordination Structure of Cu(L-His)2 in Solution[J]. Chinese Journal of Chemical Physics , 2011, 24(4): 451-456. doi: 10.1088/1674-0068/24/04/451-456
Citation: Yan Pan, Li-yun Zhang, Yang-zhong Liu. XAFS Study of Coordination Structure of Cu(L-His)2 in Solution[J]. Chinese Journal of Chemical Physics , 2011, 24(4): 451-456. doi: 10.1088/1674-0068/24/04/451-456

XAFS Study of Coordination Structure of Cu(L-His)2 in Solution

doi: 10.1088/1674-0068/24/04/451-456
Funds:  This work is supported by the Fundamen-tal Research Funds for the Central Universities (No.WK2070000008), the USTC-NSRL Association Funding (KY2060190005), and the Specialized Re-search Fund for the Doctoral Program of Higher Education (No. 20103402110020
  • Received Date: 2011-06-01
  • Multiple coordination modes are present in the CuII-histidine complex in solution and the copper coordination environment varies with pH. In this work, we have investigated the coordination geometry of Cu(His)2 complex using X-ray absorption fine structure (XAFS) analysis. Copper K-edge XAFS spectra were acquired on aqueous Cu2+ samples with his-tidine at different pH values. The coordination environments were further confirmed by chemically modified histidine. Results show that the caboxylate groups coordinate at acidic condition, while amino and imidazole nitrogens get coordinated at higher pH. For the co-ordination geometry of Cu(His)2 in solution at physiological pH, the sixfold coordination is preferentially formed, while the fivefold coordination can co-exist in equilibrium.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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XAFS Study of Coordination Structure of Cu(L-His)2 in Solution

doi: 10.1088/1674-0068/24/04/451-456
Funds:  This work is supported by the Fundamen-tal Research Funds for the Central Universities (No.WK2070000008), the USTC-NSRL Association Funding (KY2060190005), and the Specialized Re-search Fund for the Doctoral Program of Higher Education (No. 20103402110020

Abstract: Multiple coordination modes are present in the CuII-histidine complex in solution and the copper coordination environment varies with pH. In this work, we have investigated the coordination geometry of Cu(His)2 complex using X-ray absorption fine structure (XAFS) analysis. Copper K-edge XAFS spectra were acquired on aqueous Cu2+ samples with his-tidine at different pH values. The coordination environments were further confirmed by chemically modified histidine. Results show that the caboxylate groups coordinate at acidic condition, while amino and imidazole nitrogens get coordinated at higher pH. For the co-ordination geometry of Cu(His)2 in solution at physiological pH, the sixfold coordination is preferentially formed, while the fivefold coordination can co-exist in equilibrium.

Yan Pan, Li-yun Zhang, Yang-zhong Liu. XAFS Study of Coordination Structure of Cu(L-His)2 in Solution[J]. Chinese Journal of Chemical Physics , 2011, 24(4): 451-456. doi: 10.1088/1674-0068/24/04/451-456
Citation: Yan Pan, Li-yun Zhang, Yang-zhong Liu. XAFS Study of Coordination Structure of Cu(L-His)2 in Solution[J]. Chinese Journal of Chemical Physics , 2011, 24(4): 451-456. doi: 10.1088/1674-0068/24/04/451-456

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