Syntheses and characterizations of methylpalladium complexes bearing a biphenyl-based bulky phosphine ligand: Weak interactions suggested by NBO and QTAIM analyses
摘要:
A methylpalladium chloride complex bearing a biphenyl-based bulky phosphine ligand, 'Bu2P(biphenyl-2-yl) (1), namely [Pd(1)(Me)Cl](2) (=8), was synthesized by the reaction of (cod)Pd(Mc)Cl with 1. A following reaction of 8 with AgOTf gave the corresponding triflate complex, Pd(1)(Me)OTf (=9). These complexes were fully characterized by NMR spectroscopy and structurally characterized by X-ray crystallographic study. In the solid state of 8, biphenyl-based phosphine ligand 1 played a role of monodentate phosphine ligand with a possible weak eta(1)-coordination from the phenyl ring at T-position of 1. On the other hand, phosphine ligand 1 in 9 showed a bidentate coordination mode consist of sigma-donation of the phosphine and eta(2)-coordination of the phenyl ring at 1 '- and 2 '-positions. Natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) calculations also supported the existence of these weak interactions. (c) 2006 Elsevier B.V. All rights reserved.
Syntheses and characterizations of methylpalladium complexes bearing a biphenyl-based bulky phosphine ligand: Weak interactions suggested by NBO and QTAIM analyses
摘要:
A methylpalladium chloride complex bearing a biphenyl-based bulky phosphine ligand, 'Bu2P(biphenyl-2-yl) (1), namely [Pd(1)(Me)Cl](2) (=8), was synthesized by the reaction of (cod)Pd(Mc)Cl with 1. A following reaction of 8 with AgOTf gave the corresponding triflate complex, Pd(1)(Me)OTf (=9). These complexes were fully characterized by NMR spectroscopy and structurally characterized by X-ray crystallographic study. In the solid state of 8, biphenyl-based phosphine ligand 1 played a role of monodentate phosphine ligand with a possible weak eta(1)-coordination from the phenyl ring at T-position of 1. On the other hand, phosphine ligand 1 in 9 showed a bidentate coordination mode consist of sigma-donation of the phosphine and eta(2)-coordination of the phenyl ring at 1 '- and 2 '-positions. Natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) calculations also supported the existence of these weak interactions. (c) 2006 Elsevier B.V. All rights reserved.