Yang Limin, Xu Yizhuang, Gao Xin, Zhang Shiwei, Wu Jinguang
The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Carbohydr Res. 2004 Jul 12;339(10):1679-87. doi: 10.1016/j.carres.2004.04.021.
Erythritol was chosen to study the interactions between metal ions and carbohydrates. FTIR spectroscopy results indicate that a EuCl3-erythritol complex different from a previously reported one was obtained. The crystal structure of EuCl3-erythritol complex, 2EuCl3.2C4H10O4.7H2O, Mr=443.49, a=13.846(3) A , b=7.4983(15) A, c=14.140(3) A, beta=116.39(3) degrees, V=1315.1(5) A(3), Z=4, mu=5.394 mm(-1) and R=0.0395 for 2965 observed reflections and 143 parameters, was determined. Characteristic of this complex is the presence of binuclear europium ions with different coordination structures. One Eu3+ ion is nine-coordinated, with five Eu-O bonds from water molecules, and four from hydroxyl groups of two erythritol molecules and another Eu3+ is eight-coordinated with two water molecules, two chloride ions, and four hydroxyl groups from two erythritol molecules. Erythritol provides two hydroxyl groups to one lanthanide ion and the other two to another rare earth ion. The OH, CO stretching and other vibrations are shifted in the IR spectra of the complexes and the results are consistent with the crystal structure.
选择赤藓糖醇来研究金属离子与碳水化合物之间的相互作用。傅里叶变换红外光谱（FTIR）结果表明，得到了一种不同于先前报道的EuCl₃-赤藓糖醇配合物。确定了EuCl₃-赤藓糖醇配合物2EuCl₃·2C₄H₁₀O₄·7H₂O的晶体结构，Mr = 443.49，a = 13.846(3) Å，b = 7.4983(15) Å，c = 14.140(3) Å，β = 116.39(3)°，V = 1315.1(5) ų，Z = 4，μ = 5.394 mm⁻¹，对于2965个观测反射和143个参数，R = 0.0395。该配合物的特点是存在具有不同配位结构的双核铕离子。一个Eu³⁺离子为九配位，有五个来自水分子的Eu - O键，四个来自两个赤藓糖醇分子的羟基；另一个Eu³⁺为八配位，与两个水分子、两个氯离子以及来自两个赤藓糖醇分子的四个羟基配位。赤藓糖醇为一个镧系离子提供两个羟基，为另一个稀土离子提供另外两个羟基。配合物的红外光谱中OH、CO伸缩振动和其他振动发生了位移，结果与晶体结构一致。
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