Metall‐π‐Komplexe von Benzolderivaten, 36. Zur Kenntnis der Struktur von μ(η6:η6‐Biphenyl)bis[(η6‐benzol)metall]‐Komplexen in starrer Lösung und im Kristall

Metal π‐Complexes of Benzene Derivatives, 36. — The Structure of μ(η6:η6‐Biphenyl)bis[(η6‐benzene)metal] Complexes in Rigid Solution and in the Crystalline State For μ(η6:η6‐C6H5C6H5)[η6‐C6H6)Cr]2 (2) an antiperiplanar conformation has been established by means of X‐ray diffraction. Two (C6H6)Cr units coordinate to planar bridging biphenyl. This configuration differs from that of the diradical dication 2d⊕ d⊕ in rigid solution. According to the zero‐field splitting parameter D in the EPR spectrum, 2d⊕ d⊕ adopts a synclinal conformation, the half‐sandwich fragments coordinating to twisted biphenyl (dihedral angle α ≈︁ 60°).