Group 9 half-sandwich complexes containing the unique P,P′-diphenyl-1,4-diphospha-cyclohexane ligand: Synthesis, X-ray structure analyses and spectroscopic studies

Synthesis, characterization and crystal structure of (cis-P,P′-diphenyl-1,4-diphospha-cyclohexane)molybdenum(0)tetracarbonyl

“…Recently, work from our laboratory on dpdpc coordination reactions with Group 9 metals has identified a bridging, binuclear intermediate that can be converted to a monomeric product, illustrating the versatility of coordination modes of this ligand [10]. Further, the structurally characterized [Cp * Rh(dpdpc)Cl]PF 6 compound shows a P-Rh-P bite angle of 71.60°, the most acute bite angle for a two-carbon bridged bidentate phosphine ligand at the time of its publication [10].…”

“…Recently, work from our laboratory on dpdpc coordination reactions with Group 9 metals has identified a bridging, binuclear intermediate that can be converted to a monomeric product, illustrating the versatility of coordination modes of this ligand [10]. Further, the structurally characterized [Cp * Rh(dpdpc)Cl]PF 6 compound shows a P-Rh-P bite angle of 71.60°, the most acute bite angle for a two-carbon bridged bidentate phosphine ligand at the time of its publication [10].In this work we have synthesized a new metal complex of the dpdpc ligand with a Mo(0) metal center and obtained its X-ray crystal structure. Refluxing a mixture of Mo(CO) 6 with one equivalent of the phosphine ligand, dpdpc, in diglyme for 1 h affords the metal complex (dpdpc)Mo(CO) 4 as determined by 31 P{ 1 H} NMR (Scheme 1).…”