Reaction of the dilithium salt of tripyridyldiamine, Li2tpda, and CrCl2 in THF gave the pentachromium compound Cr5(tpda)4Cl2·CH2Cl2 in which the metal atoms were arranged in a linear fashion with localized quadruple bonds CrCr · · · CrCr · · · Cr.
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Cotton et al. (1999) studied this question.
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