Room temperature ligand fragmentation in the reaction between PhCCo3(CO)(9) and Ph2PN(Me)N(Me)PPh2. X-ray diffraction structure of PhCCo3(Co)(8)[Ph2PP(O)Ph-2]

The cobalt cluster PhCCo3(CO)(9) reacts with the bis(phosphanyl)hydrazine l igand bis(diphenylphosphino)dimethylhydrazine (dppdmh) in CH2Cl2 with added Me3NO to give the monosubstituted cluster PhCCo3(CO)(8)[Ph2PP(O)PPh2] as t he major isolable product. The solid-state structure of this new cluster wa s unequivocally established by X-ray diffraction analysis, which has confir med the presence of a noncoordinated (O)PPh2 moiety. PhCCo3 (CO)(8)[Ph2PP(O )Ph-2] crystallizes in the triclinic space group <P(1)over bar>, a = 12.036 (2), b = 12.037(2), c = 15.124(3) Angstrom, alpha = 84.82(1)degrees, beta = 89.44(2)degrees, gamma = 60.09(1)degrees, V = 1890.0(6) Angstrom(3), Z = 2 , and d(calc) = 1.540 g/cm(3).