Formal bond orders can sometimes be misleading. For example, [Re2Cl9]-, which has a metal–metal bond order of 3.0, has a longer Re–Re bond (270.4 pm) than [Re2Cl9]2-, (247.3 pm), which has a bond order of 2.5. Account for the shorter bond in [Re2Cl9]2-. (Hint: see G. A. Heath, J. E. McGrady, R. G. Raptis, A. C. Willis, Inorg. Chem. , 1996 , 35 , 6838.)
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