Solution Thermochemical and Structural Studies of Ligand Substitution of N-Pyrrolyl Phosphine Ligands in the (p-cymene)RuCl2(PR3) System
摘要:
The enthalpies of reaction of [(p-cymene)RuCl2](2) (p-cymene = (CH3)(2)CHC6H4CH3) With a series of N-substituted tertiary phosphine ligands, leading to the formation of (p-cymene)RuCl2(PR3) complexes (PR3 = tertiary phosphine) have been measured by solution calorimetry in CH2Cl2 at 30 degrees C. The overall relative order of stability, within this series, is as follows: P(NC4H4)(3) < P(NC4H4)(2)(C6H5) < P(NC4H4)(C6H5)(2) < P(NC4H8)(3). Structural studies have been performed on three complexes in the (p-cymene)RuCl2(PR3) system, PR3 = P(NC4H4)(3), P(NC4H4)(2)(C6H5), and PBz(3). Thermochemical and structural data are compared to provide an understanding of the bonding involving these N-pyrrolyl-substituted phosphine ligands.