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用IR和XPS研究了乙酸乙酯与MgCl和TiCl_4反应生成的络合物MgCl(CHCOOCH_5),TiMgCl(CH_5COOCH_5)_4和(TiCl_4CHCOOCH_5)等,并与络合物的晶体结构数据进行了对比。结果表明:前二者的vc=o和vc_o相当接近,而与后者相差较大。络合物中碳—氧键键长与红外光谱相应峰的位移对比,C=O键长相对大者其vc=o向低波数位移也大;C—O健长相对小者,其vc_o向高波数的位移亦大。对比表明,络合物的红外光谱测定结果与其晶体结构一致,Mg_2和C1结合能也证明了前两种络合物一样,其中 C=O与Mg生成了 O→Mg配键。
The complexes MgCl (CHCOOCH_5), TiMgCl (CH_5COOCH_5) _4 and (TiCl_4CHCOOCH_5) formed by the reaction of ethyl acetate with MgCl and TiCl_4 were studied by IR and XPS. The crystal structures were compared with those of the complexes. The results show that: the first two vc = o and vc_o quite close, but with the latter a larger difference. The carbon-oxygen bond length in the complex was compared with that of the corresponding peak in the infrared spectrum. For the relatively large C = O bond length, the vc = o shift to the low wavenumber is also large. For the relatively small C-O growth, the vc_o direction High wave number displacement is also large. The results show that the infrared spectrum of the complex is consistent with its crystal structure. The binding energy of Mg_2 and C1 also proves the same as that of the first two complexes, in which O → Mg bonds are formed between C = O and Mg.