Metal–Metal Distances at the Limit: Cr–Cr 1.73 Å – the Importance of the Ligand and its Fine Tuning

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$\rm P{\bar 1}$;a= 18.0850(17) b= 18.1010(17) c= 18.1180(2) Å; α = 75.711(8) ß= 76.094(8) γ= 89.885(5)°;R1= 0.0626 wR2(all data) = 0.1315.

Pccn;a= 13.4340(8) b= 19.7350(11) c= 19.8000(13) Å; α =β=γ= 90.00°;R1= 0.0490 [I> 2σ(I)] wR2(all data) = 0.0932.

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All structure optimisations were carried out at BP86/TZVP DFT level. NPA and ELF analyses were based on single point calculations at B3LYP/TZVPP level.

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The employed model structure was based on X‐ray structure data of3 but the positions of all hydrogen atoms were optimised.

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