Citation: YANG Zai-Wen, AYGUL Naman, LIU Xiang-Rong, ZHAO Shun-Sheng, ZHAO Wei-Qin, YANG Shui-Lan. Structure of Copper Chelate of 2-Hydroxy-4-methylthiobutanoic Acid as Trace Mineral Additive in Animal Feeding[J]. Chinese Journal of Structural Chemistry, ;2015, 34(1): 147-153. doi: 10.14102/j.cnki.0254-5861.2011-0490 shu

Structure of Copper Chelate of 2-Hydroxy-4-methylthiobutanoic Acid as Trace Mineral Additive in Animal Feeding

1.
College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

Received Date: 1 September 2014
Available Online: 28 November 2014
Fund Project: The work was supported by the National Natural Science Foundation of China (No. 21301139, 21373158, 21103135, 51304158) (No. 21301139, 21373158, 21103135, 51304158)Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 2013JK0651) (No. 2013JK0651)the Doctoral Starting Fund (No. 2014QDJ004) from Xi'an University of Science and Technology were also acknowledged (No. 201221)

The chelate complex of Cu²⁺ with 2-hydroxy-(4-methylthio)butanoate (MHA_-H, the anion derived from the so-called methionine hydroxy-analogue, largely used in animal nutrition as a source of methionine, MHA) is an efficient, bioavailable trace mineral additive for animal feeding. The structure of MHA_-H copper chelate was investigated by single-crystal X-ray diffraction. The crystal structure (C₁₀H₁₈CuO₆S₂, 1, monoclinic, space group P2₁/c, Z=2, a=16.158(4), b=4.9733(12), c=9.159(2)Å, β=104.786(4)°) exhibits that two MHA_-H ligands coordinate with a Cu^Ⅱ ion to form a square-planar environment completed to an octahedron through interaction with carbonyl oxygens of neighboring molecules, which expand to constitute a two-dimensional sheet coordination network. And a separation between the hydrophilic and lipophilic moieties like micelles was found in the packing structure. X-ray powder diffraction and thermogravimetric analysis were used to study the phase purity of the bulk sample and thermostability of complex 1, respectively.
- copper complex,
- methionine hydroxy-analogue,
- metal chelates for animal feeding,
- X-ray structure
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