Synthesis, structure and kinetics of Group 6 metal carbonyl complexes containing a new ‘P2N’ mixed donor multidentate ligand
†
Abstract
The ‘P2N’ mixed donor ′
)] (M = Cr, Mo or W). Reaction of PNCHP with [Mo(CO)3(CHT)] (CHT =
′
)] which readily isomerises to mer-[Mo(CO)3(PNCHP-κ3P,N,P
′
)] in solution. PNCHP reacts with UV-irradiated tetrahydrofuran solutions of [M(CO)6] (M = Cr or W) to yield phosphorus bound co-ordination isomers of [M(CO)5(PNCHP-κ1P)]. The same reaction when carried out with one half equivalent of PNCHP yields the PNCHP bridged dinuclear species [{M(CO)5}2(PNCHP-κ2P,P
′
)]. The compounds have been characterised by spectroscopic means and the single crystal structures of cis-[Cr(CO)4(PNCHP-κ2N,P)], cis-[W(CO)4(PNCHP-κ2P,P
′
)], mer-[Mo(CO)3(PNCHP-κ3P,N,P
′
)] and [{W(CO)5}2(PNCHP-κ2P,P
′
)] determined. In addition, the isomerisation kinetics of fac- to mer-[Mo(CO)3(PNCHP-κ3P,N,P
′
)] has been studied to determine rate constants and thermodynamic