The Twinned Crystal Structure of Zinc(II) Acetylacetonate Trimer

Abstract

The crystal structure of the title compound, C30H42O12Zn3, originally determined from untwinned crystals (Bennett et al. Acta Cryst B 24:904, 1968) has been redetermined from twinned crystals. The effect of the twinning is that additional reflections appear in the diffraction pattern leading to a unit cell with a too long c-axis in which the structure cannot be solved. Thus, for a successful structure solution the correct unit cell has to be found and for refinement the twinning has to be taken into account. The central Zn atom is located on a twofold rotation axis. It is hexacoordinated in a distorted octahedral mode, whereas the coordination geometry of the two terminal Zn atoms is distorted trigonal bipyramidal. The crystal structure of the title compound, Zinc(II) acetylacetonate trimer, has been redetermined from twinned crystals. For a successful structure solution the correct unit cell had to be found and for refinement the twinning had to be taken into account. The central Zn atom is located on a twofold rotation axis. It is hexacoordinated in a distorted octahedral mode, whereas the coordination geometry of the two terminal Zn atoms is distorted trigonal bipyramidal.