‘Electronic bending’ of imido ligands and the effect on the coordination mode of a tridentate ancillary ligand
摘要:
The five-coordinate mixed-imido complex [Mo(Nt-Bu)(NC6F5)(L)] (1) can be prepared in high yield via treatment of [Mo(Nt-Bu)(NC6F5)(Ot-Bu)(2)] with LH2, where LH2 is 2,6-bis(2-hydroxy-2,2-diphenylethyl)pyridine. Contrastingly, the reaction of [Mo(NAd)(2)(NC6F5)(Ot-Bu)(2)] (Ad = adamantyl, C-6-H-10) with LH2 gave [Mo(NAd)(2)(L)] (2) via an imido-exchange reaction. Complex 2 can also be synthesised via treatment of in situ generated [Mo(NAd)(2)(Ot-Bu)(2)] with LH2; the latter method also results in trace amounts of the five-coordinate complex [MoCl(NAd)(2)(L-dehyd)] (3) (L-dehyd = 2-(2-hydroxy-2,2-diphenylethenyl)pyridine). The structures of 1-3 have been determined by X-ray crystallographic study. In each complex, the geometry at the metal is distorted trigonal bipyramidal with the pyridinediolate ligand adopting an 'aea' bonding arrangement in I and an 'eee' arrangement in 2. The angle associated with the imido moiety also varies, with the greatest deviations found in 1 and 3, indeed, the pentafluoroimido ligand in I has one of the largest deviations from linearity for an M-N-C angle recorded to-date [135.98(16)degrees]. This has been rationalised on the basis of an electronic effect rather than intramolecular steric interactions or crystal packing forces. (c) 2007 Elsevier Ltd. All rights reserved.