The title compound, [Ni(Ph2PCH2PPh2)(2)](ClO4)(2), was synthesized and its
structure determined crystallographically. The Ni atom lies on an inversion
centre and is at the center of a square formed by four P atoms which are n
ecessarily coplanar. The Ni-P distances are 2.2188 (5) and 2.2322 (5) Angst
rom, and the P- Ni-P angle is 73.12 (3)degrees. The unique perchlorate anio
n is not coordinated to the Ni atom.