Abstract. [Ru2C13(PMe2Ph)6]PF6, Ru2ClaPTF6C48H66, M=1282. Monoclinic, P21/c, a=14.43 (1), b=16.41 (1), c=23-86 (2)A, fl=97.5 (1) °, V=5601 A 3, Dm= 1"55 (1), Dc=1"53 g cm -3, Z=4, /z=9"25 cm -1. R= 0.069 for 4983 observed data; two Ru, seven P and three C1 atoms anisotropic. The Ru atoms are approximately octahedrally coordinated: Ru...Ru= 3.39, Ru-C1 range from 2.46 to 2.52, Ru-P from 2.28 to 2.30 A; average Ru-CI-Ru = 86 °.