Synthesis and structural analysis of copper(II) cysteine complexes |
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| Authors: | Kenneth M Dokken John McClure |
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| Institution: | a Department of Chemistry, University of Texas at El Paso, 500 W. University El Paso, TX 79968, United States
b Department of Metallurgical and Materials Engineering, University of Texas at El Paso, 500 W. University El Paso, TX 79968, United States |
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| Abstract: | This report describes the synthesis and structural analysis of stable copper(II) cysteine complexes. Pale pink copper(II) cysteine complexes were synthesized in mole ratios of 1:2, 1:4, and 1:6 of copper(II):cysteine in ethanol. Infrared spectroscopy and X-ray absorption spectroscopy confirmed that copper(II) binding occurred via the thiol ligand of cysteine. XANES analysis showed that the oxidation state of copper remained as copper(II) and the local atomic geometry was similar in all of the cysteine complexes. The EXAFS data indicate that the copper(II) cysteine complexes are forming ring type structures with sulfur ligands from the cysteines acting as bridging ligands. X-ray diffraction revealed that the copper(II) cysteine complexes formed monoclinic cells with maximum crystallinity found in the 1:4 copper(II):cysteine complex. |
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| Keywords: | Copper cysteine complexes Infrared spectroscopy X-ray diffraction X-ray absorption spectroscopy |
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