F. Albert Cotton, Lee M. Daniels, Tongbu Lu, Carlos A. Murillo and Xiaoping Wang
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 · · · Cr
Cr · · · Cr.