Interactions between Metal Ions and Carbohydrates. Coordination Behavior of Neutral Erythritol to Ca(II) and Lanthanide Ions

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• 作者：Limin Yang ; Yunlan Su ; Yizhuang Xu ; Zheming Wang ; Zonghui Guo ; Shifu Weng ; Chunhua Yan ; Shiwei Zhang ; and Jinguang Wu
• 刊名：Inorganic Chemistry
• 出版年：2003
• 出版时间：September 22, 2003
• 年：2003
• 卷：42
• 期：19
• 页码：5844 - 5856
• 全文大小：434K
• 年卷期：v.42,no.19(September 22, 2003)
• ISSN：1520-510X

文摘

The study of the sugar-metal ion interactions remains one of the main objectives of carbohydrate coordinationchemistry because the interactions between metal ions and carbohydrates are involved in many biochemicalprocesses. This paper presents a comparison of coordination structures of erythritol with alkaline-earth-metal andlanthanide chloride and nitrate in the solid state using FT-IR and X-ray diffraction. Neutral, nondeprotonated erythritol(E) reacts with CaCl₂ to give three CaCl_2-erythritol (CaE(I), CaE(II), CaE(III)) complexes, showing that three of thefive general features of calcium-carbohydrate complexes deduced in the reference encounter contrary examples.Different coordination structures have been observed for calcium and lanthanide chloride and nitrates. The coordinationof carbohydrates to metal ions is complicated, and erythritol, chloride ions, nitrates, water molecules, and ethanol(crystallization medium and reaction solvents) have the chance to coordinate to metal ions. IR spectral resultsshow that different lanthanide ions, from LaCl₃ to TbCl₃, have similar coordination structures with erythritol. Theresults show that erythritol can act as two bidentate neutral ligands (CaE(I), CaE(II), CaE(III), CaEN, PrE, NdE) oras a three-hydroxyl donor (NdEN). The IR results are consistent with the crystal structures.