Comparison of the Cr–Cr Quadruple and Quintuple Bonding Mechanisms

The borderless world of chemical bonding across the van der Waals crust and the valence region

“…Having seen how the penetration indices allow us to compare bonds of different pairs of main group elements, an obvious test is to carry out a similar analysis for transition metals that can span five bond orders, such as Cr or Mo in their different oxidation states. The distribution of Cr–Cr bond distances as a function of the bond order, commented on by us in previous work, 257 can be easily translated to the penetration index language. The results are summarized in Fig.…”