Tri(1-cyclohepta-2,4,6-trienyl)- phosphane, P(C7H7)3, as a Tripodal Tetradentate Ligand in Cationic, Five-coordinate Complexes of Platinum(II) and Palladium(II)

Abstract

Chloride abstraction, using AgPF6, from tri(1- cyclohepta-2,4,6-trienyl)phosphane platinum and palladium dichloride, [P]MCl2 [M = Pt (1), Pd (2)], affords the complexes {[P]MCl}PF6 [M = Pt (3), Pd (4)] in good yields. The central metal is coordinated by the chloro ligand, the phosphorus atom and by three η2-C=C units, one of each C7H7 ring. This assignment of a highly symmetrical C3v structure is based on a consistent set of NMR data (1H, 13C, 31P, 195Pt NMR), in agreement with NMR data of the corresponding known neutral iridium and rhodium complexes [P]MCl [M = Ir (5), Rh (6)]. The chemical shift δ103Rh of 6 was determined, and a nearly linear relationship δ195Pt / δ103Rh was established.