The molecule ylbis[tris(p-fluorophenyl)phosphine]molybdenum(0), [ Mo(C
18H12F3P)2(CO)4], has twofold crystallographic symmetry; the Mo geomet
ry is irregular octahedral, with principal dimensions Mo-P 2.5644 (4),
Mo-C (trans to P) 1.9869 (16), Mo-C (trans to C) 2.0310 (18) angstrom
, P-Mo-P 107.33 (1), trans-P-Mo-C 166.76 (5) and trans-C-Mo-C 174.31 (
8)-degrees. The P geometry is irregular tetrahedral, with enlarged Mo-
P-C [average 115-94 (5)-degrees] and reduced C-P-C [average 102.22 (7)
-degrees] angles. Mo-95 NMR chemical shift data are in accord with the
observed structure.