Crystal and molecular structure of bromo-bis(bis-diphenylphosphino-ethylene)-nickel(II)-tetraphenylborate

The Ni(II) complex of the ligand cis-1,2[bis(diphenylphosphino)ethylene] (VPP), [Ni(VPP)2Br]BPh4, crystallizes in the orthorhombic space group P2121,2, with a=25.971(6), b=24.508 (6), c=19.642(5) Å, Z=8. The structure was determined by the procedure DIRDIF from Cu Kα automatic diffractometer X-ray data and refined by block-diagonal least-squares to R=11% for 5572 reflections. A question on the space group assignment between P21212 and P212121 was resolved only after the complete structure had been determined. The detailed crystal and molecular structure is presented. © 1982 Plenum Publishing Corporation.