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An up-and-coming sibling: Unlike the cyanide ion (CN−), which is one of the fundamental ions in inorganic chemistry, cyaphide (CP−) is not stable unless it is coordinated to a metal center, either as a bridging ligand or, as just recently demonstrated, as a terminal ligand (see scheme; L=monodentate phosphane, X=halide).
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Robert J. Angelici (2006) studied this question.
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