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众所周知,在化学实验中,由于碘难溶入水,欲配制单质碘的水溶液,则用碘分子溶入碘化钾的水溶液中制成。结果是形成了三碘离子I_3~-(KI_3)。但对I_3~-离子结构的看法,至今并不完全一致,有的人认为它是一种带负电荷的中心离子的一类络离子。还可写成[II_2]~-络离子的组成形式,即I~-离子为中心离子,而I_2分子为配位体,这种看法不能令人满意,值得商榷。
As we all know, in chemical experiments, due to poor solubility of iodine into water, to prepare an aqueous solution of elemental iodine, the iodine molecules dissolved in potassium iodide aqueous solution made. The result is the formation of triiodide ions I_3 ~ - (KI_3). However, the view of the structure of I_3 ~ - ions has not been completely consistent so far. Some people think that it is a type of complex ion of negatively charged central ion. It is also arguable that the composition of [II_2] ~ - complex ions, namely I ~ - ions as central ions and I_2 molecules as ligands, is unsatisfactory.