The crystal and molecular-structure of fac, fac-mo 2(CO)6(Ph2AsCH2CH2PPh2)3 a case of chemically imposed disorder in the crystal structure

Abstract

Crystals of fac, fac-Mo 2(CO)6(ape)3 (ape = Ph2AsCH2CH2PPh2) are monoclinic, P 21/n (No. 14), a 15.842 (4), b 17.178 (4), c 14.144 (4) Å, β 98.80(3)º. The compound is dimeric with a bridging ape group, and the stereochemical arrangement of the carbonyl groups about each metal atom is facial. The facial arrangement leads to a chemically imposed disorder among the ape ligand donor atoms; this makes it impossible to distinguish arsenic and phosphorus atoms in the crystal structure determination. © 1992 ASEG.