The shortest metal–metal bond so far is found in complex anion 2 (CrCr 1.7397(9) Å), which is the one-electron reduction product of thermally stable mixed-valent complex 1 (see scheme). Experimental data unambiguously show that the electronic configuration of 1 is σ2π4δ3, and theoretical studies confirm the presence of a CrCr quintuple bond in 2. Ar=2,6-C6H3(CH3)2.
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Tsai et al. (2008) studied this question.
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