Synthesis and structure of [pzBu2t]Mo(PMe3)4H, a d4 molybdenum complex that exhibits η2-coordination of the 3,5-di-t-butylpyrazolyl ligand
摘要:
Mo(PMe3)(6) reacts with [pz(Bu'2)]H at 80 degreesC to give [eta(2)-pz(Bu'2)]Mo(PMe3)(4)H, the first structurally characterized d(4) eta2-pyrazolyl complex of molybdenum. The hydride ligand of [eta(2)-pz(Bu'2)]Mo(PMe3)(4)H is displaced from the mean Mo-N-N-P-cis-P-cis plane, such that the distorted seven-coordinate geometry may be viewed as being based on a distorted dodecahedron with a vacant coordination site. DFT (B3LYP) calculations suggest that the origin of the displacement of the hydride ligand is due to steric interactions with the pair of 'cis' PMe3 ligands. (C) 2002 Elsevier Science Ltd. All rights reserved.