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.
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Brynda et al. (2006) studied this question.
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