金属离子与碳水化合物之间的相互作用。中性赤藓糖醇与Ca(II)和镧系离子的配位行为。
Interactions between metal ions and carbohydrates. Coordination behavior of neutral erythritol to Ca(II) and lanthanide ions.
作者信息
Yang Limin, Su Yunlan, Xu Yizhuang, Wang Zheming, Guo Zonghui, Weng Shifu, Yan Chunhua, Zhang Shiwei, Wu Jinguang
机构信息
The State Key Laboratory of Rare Earth Materials Chemistry and Applications, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
出版信息
Inorg Chem. 2003 Sep 22;42(19):5844-56. doi: 10.1021/ic0300464.
The study of the sugar-metal ion interactions remains one of the main objectives of carbohydrate coordination chemistry because the interactions between metal ions and carbohydrates are involved in many biochemical processes. This paper presents a comparison of coordination structures of erythritol with alkaline-earth-metal and lanthanide chloride and nitrate in the solid state using FT-IR and X-ray diffraction. Neutral, nondeprotonated erythritol (E) reacts with CaCl(2) to give three CaCl(2)(-)erythritol (CaE(I), CaE(II), CaE(III)) complexes, showing that three of the five 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 coordination of 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 results show that different lanthanide ions, from LaCl(3) to TbCl(3), have similar coordination structures with erythritol. The results show that erythritol can act as two bidentate neutral ligands (CaE(I), CaE(II), CaE(III), CaEN, PrE, NdE) or as a three-hydroxyl donor (NdEN). The IR results are consistent with the crystal structures.
糖与金属离子相互作用的研究仍然是碳水化合物配位化学的主要目标之一，因为金属离子与碳水化合物之间的相互作用涉及许多生物化学过程。本文利用傅里叶变换红外光谱（FT-IR）和X射线衍射对赤藓糖醇与碱土金属以及镧系元素的氯化物和硝酸盐在固态下的配位结构进行了比较。中性、未去质子化的赤藓糖醇（E）与CaCl₂反应生成三种CaCl₂·赤藓糖醇（CaE(I)、CaE(II)、CaE(III)）配合物，这表明参考文献中推导的钙-碳水化合物配合物的五个一般特征中有三个出现了反例。对于钙以及镧系元素的氯化物和硝酸盐，观察到了不同的配位结构。碳水化合物与金属离子的配位很复杂，赤藓糖醇、氯离子、硝酸根离子、水分子和乙醇（结晶介质和反应溶剂）都有可能与金属离子配位。红外光谱结果表明，从LaCl₃到TbCl₃，不同的镧系离子与赤藓糖醇具有相似的配位结构。结果表明，赤藓糖醇可以作为两个双齿中性配体（CaE(I)、CaE(II)、CaE(III)、CaEN、PrE、NdE）或作为一个三羟基供体（NdEN）。红外光谱结果与晶体结构一致。
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