名称:
Oxidative assembly of octahedral nickel(II)-tris(3,5-dimethylpyrazol-1-yl)methane (Tpm∗) complexes by reaction of Ni(COD)2 (COD=1,5-cyclooctadiene) with putative oxene and nitrene precursors
摘要:
Reactions of [Ni-0(COD)(2)] (COD = 1,5-cyclooctadiene) with meta-chloroperoxybenzoic acid, phenyl-N-tosylimidoiodinane or 2-(tert-butylsulfonyl)iodosylbenzene were performed in THF solution in the presence of one equivalent of tris(3,5-dimethylpyrazol-1-yl)methane (Tpm*), yielding the product complexes [Tpm*Ni-II(OH2)(3-ClC6H4CO2)(2)] (2), [(Tpm*)(2)Ni-II][Ni-II(NHTs)(4)] (3), and [Tpm*Ni-II(OH)(2)(OH2)] (4), respectively. Products 2-4 arise from oxidation of solvated [Ni-0(COD)(2)], with subsequent ligation of Tpm* and substrate fragments leading to assembly of disparate octahedral nickel(II) centers. For comparative purposes, the previously reported complex [(Tpm*)Ni-II(OH2)Cl-2] (1) was also obtained from Tpm* and NiCl2. All complexes were characterized spectroscopically, and complexes 1-3 were also structurally characterized by X-ray crystallography. (C) 2012 Elsevier Ltd. All rights reserved.