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文献中碘分子与卤离子生成络合物的研究已有不少报道.但有关多卤络合物的研究均是在碘分子浓度较高的情况下以及在非水溶液中的多聚反应.我们用分配法研究了在碘分子浓度较低的情况下,碘分子与氯离子、溴离子和碘离子在水溶液中的络合反应,并用作图法处理实验数据,测定了相应的各络合物的稳定常数,表明有生成多卤络合物的可能性存在. 根据络合物的平衡理论,可以把碘分子(I_2)看成中心体,卤离子X~-(Cl~-,Br~-,I~-)看成配位体,在水溶液中有以下的各级平衡:
There are a lot of reports on the formation of complexes between iodine and halides in the literature, but studies on polyhalo complexes have been carried out at high iodine concentration and in non-aqueous solutions. The partitioning method was used to study the complexation reaction of iodine molecules with chloride, bromide and iodide ions in aqueous solutions at low iodine concentration. The complexing reaction of iodine molecules with aqueous solutions was also studied. The experimental data were obtained and the corresponding complexes The stability constant shows that there is a possibility of generating polyhalogen complex.According to the equilibrium theory of complex, the iodine molecule (I 2) can be regarded as the central body and the halide ion X ~ (Cl ~ -, Br ~ , I ~ -) as a ligand in aqueous solution at the following levels of equilibrium: