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在分析化学中愈来愈广泛的应用着络合物生成反应,故络合物的研究对分析化学具有重大的意义。然而过去对溶液中络合物的研究是不够的,在应用络合物生成反应时,对于溶液中络合物的组成一般不去研究,而从固体盐类的组成来推测,因此常常导出不正确的结论。例如,比色测定铁最常用的硫氰酸铁络合物过去却很少研究,而推测为 Fe(CNS)_3,[Fe(CNS)_6](?)等,但是经过 Bent 等特别是等的详细研究证明溶液中生成了许多配位数不同的络合物,而主要有色络合物的组成为
In analytical chemistry, the complex formation reaction is more and more widely used. Therefore, the study of complex has great significance for analytical chemistry. In the past, however, the study of complexes in solution was inadequate and the composition of complexes in solution was generally not investigated when using the complex formation reaction, but was speculated from the composition of the solid salts, so it is often derived Correct conclusion. For example, the colorimetric determination of iron most commonly used ferric thiocyanate complexes in the past rarely been studied, and presumably Fe (CNS) _3, [Fe (CNS) _6] (?), Etc., but after Bent et al The detailed study proves that many complex complexes with different coordination number are formed in the solution, while the composition of the major colored complex is