Add time:07/22/2019         Source:sciencedirect.com

The structures of (η6-C18H24)Cr(CO)3 (1) and of a trigonal form of [(η6-C18H24)Mn(CO)3]BF4 (2) are reported. For 1 the CO ligands project on to the unbridged CC bonds of the substituted benzene ring with CrC(aryl) 2.230(5) Å (average). Crystals of 2 are intimately twinned, but this was successfully modelled in the refinement. There are two independent cations in the structure, one with the same conformation found for 1 and the other with the CO ligands rotated so they project over the peripheral rings of the arene ligands. The MnC(aryl) bonds average 2.224(2) Å. Together with the previously reported orthorhombic form of 2, the structures discussed provide the first comparisons of an iso-electronic pair of (arene)Cr(CO)3 and [(arene)Mn(CO)3]+ species.

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