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金属有机化合物分析(ⅩⅤ)——稀土-金属双核金属有机化合物的薄层色谱和红外光谱关系的研究

Analysis of Organometallic Compounds(ⅩⅤ)--Study on the Relationship Between the Rf Values of Thin Layer Chromatograph and Infra-Red Spectral Absorption of Some Rare Earth-Metal Binuclear Organometallic Compounds

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【作者】 李松兰杨学谨孙月稳李萍王序昆周晓欣

【Author】 Li Songlan, Yang Xuejin, Sun Yuewen, Li Ping (Department of Chemistry, Nankai University, Tianjin)Wang Xukun, Zhou Xiaoxin (Institute of Elemento-Organic Chemistry, Nankai University, Tianjin)

【机构】 南开大学化学系南开大学元素有机化学研究所南开大学元素有机化学研究所

【摘要】 用薄层色谱法,分离了稀土-金属双核金属有机化合物,该类化合物的薄层色谱R_f值和红外光谱vco波数之间存在一致的变化关系,本文对这种变化关系作了初步解释。

【Abstract】 A series of rare earth-metal binuclear organometallic compounds with the general formulae [(C6H5CO)2CH]2 Re-Fe (or Mo) (CO)2(π-C5H5), [(C6H5CO)2CH]2Re-Sn(G6H5)3 have been separated successfully by TLC using silica-gel as absorbent and xylene-absolute alcohol-petroleum ether (1:1:20, 1:0.4:20 and is 0.5:20) as development. The minimum detectable quantity is 0.01649mg per millitre soluticn of determined binuclear organometallic compounds.The observation of the satisfactory correspondence between the Rf values obtained in the thin-layer chromatograph of the compounds and the IR data(vc-o in cm-1) allows us to make the primary theoretical explanation.For the compounds with the same coordinated metal and organic ligand but different rare earth metals the observed vc-o in cm-1 values vary with the change of dipolar force constant K resulted from the variation of the rare earth metals in these compounds. That is, as the K increases, vc=o in cm-1 increases too. Rf values on TLC also match with the vc-o in cm-1 obtained from IR measurement.The compounds of the same rare earth metal and organic ligand but differing only in coordinated metal, the IR data (vc-o in cm-1) and Rf values on TLC decrease with the increase of their ionic radii and polarities, respectively.

  • 【文献出处】 高等学校化学学报 ,Chemical Research In Chinese Universities , 编辑部邮箱 ,1988年12期
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