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首页> 外文期刊>Electrophoresis: The Official Journal of the International Electrophoresis Society >Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents.
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Capillary electrophoresis of boron cluster compounds in aqueous and nonaqueous solvents.

机译：硼簇化合物在水性和非水性溶剂中的毛细管电泳。

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摘要

The electrophoretic properties of boron cluster compounds were determined in water, methanol and ACN as solvents of the BGE and discussed based on the principles of ion migration. Two types of boron cluster compounds were investigated. One type consisted of derivatives of the nido-7,8-dicarbaundecaborate cluster, the other types are derivatized cobalt bis(dicarbollide) ions (COSANs) whose central cobalt atom is sandwiched by two 7,8-dicarbaundecaborate clusters. The BGE in all solvents was acetate/acetic acid buffer with pH 4.75 in water, 9.7 in methanol and 22.3 in ACN, respectively, at different ionic strength between 5 and 30 mM. The dependence of the mobility on ionic strength could not be explained by the theory of Debye, Huckel and Onsager, but good agreement was found upon considering an ion size parameter. Limiting mobilities were derived by curve fitting, and by the aid of the solvent viscosities the hydrodynamic radii of the analyte anions were calculated. They are between 0.25 and 0.48 nm, and were nearly independent of the solvent. Electrophoresis of the analytes in a BGE consisting of 6 mM perchloric acid in ACN allows the conclusion that the present boron cluster compounds behave as stronger acids than perchloric acid.
机译：在水，甲醇和乙腈作为BGE的溶剂中测定了硼簇化合物的电泳性能，并根据离子迁移原理进行了讨论。研究了两种类型的硼簇化合物。一种类型是由Nido-7,8-二碳杂十碳酸盐弱簇形成的衍生物，另一种类型是衍生化的钴双（二咔糖）离子（COSAN），其中心钴原子被两个7,8-二碳杂十碳酸盐弱簇夹在中间。在所有溶剂中，BGE分别为乙酸盐/乙酸缓冲液，水中的pH值为4.75，甲醇中的9.7，ACN中的22.3，离子强度在5至30 mM之间。迁移率对离子强度的依赖性无法用Debye，Huckel和Onsager的理论来解释，但是在考虑离子尺寸参数后发现了很好的一致性。通过曲线拟合得出极限迁移率，并借助溶剂粘度计算出分析物阴离子的流体动力学半径。它们在0.25和0.48nm之间，并且几乎与溶剂无关。在ACN中由6 mM高氯酸组成的BGE中的分析物进行电泳可以得出以下结论：当前的硼簇化合物表现出比高氯酸更强的酸。

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