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High five: Multiconfigurational quantum chemical methods show that a quintuple bond is present between the two CrI units in the model complex PhCrCrPh. The CrCr (1.75 Å) and CrPh (2.02 Å) bonds are shorter than those in the recently reported compound Ar′CrCrAr′ (Ar′=2,6-(2,6-iPr2C6H3)2C6H3; 1.83 and 2.15 Å, respectively). This difference is attributed to the additional CrAr′ interactions.
Brynda et al. (Wed,) studied this question.