(Pentaphenyl)aluminacyclopentadiene as a complexing ligand. The molecular structure of (pentaphenyl)aluminacyclopentadiene and its complex with 1,5-cyclooctadienenickel

Abstract

The molecular conformations of a (pentaphenyl)aluminacyclopentadiene ligand (I) and its complex with 1,5-cycloactadienenickel (II) have been determined from single crystal X-ray data collected at room temperature with counter methods. The free ligand crystallizes in the monoclinic space group Cc with 4 molecules in a unit cell of dimensions a 10.5598(5), b 22.7089(12), c 13.3417(4) Å, β 98.064(3)°; its (COD)Ni complex Crystallizes in the monoclinic space group P2 1/ n with 4 molecules in a unit cell of the dimensions a 11.9948(8), b 16.9758 (13), c 18.7721(14) Å. β 97.958(3)°. Both structures have been refined anisotropically to R values of 0.0577 and 0.0493, respectively. Upon complexation of I to the nickel atom the planarity of the ring system is distorted, with the aluminum being bent away from the nickel. A direct metal—metal interaction in II (NiAl: 2.748(1) Å) cannot be ruled out.