Lutetium alkyl and hydride complexes in a non-cyclopentadienyl coordination environment
作者:Marcin Konkol、Thomas P. Spaniol、Małgorzata Kondracka、Jun Okuda
DOI:10.1039/b710228n
日期:——
Lutetium alkyl complexes [Lu(L)(CH2SiMe3)(THF)n], which contain a sulfur-linked bis(phenolato) ligand such as 2,2′-thiobis(6-tert-butyl-4-methylphenolate) (L = tbmp, 1) or 1,4-dithiabutanediyl-bis(6-tert-butyl-4-methylphenolate) (L = etbmp, 2), were isolated from the reaction of the lutetium tris(alkyl) complex [Lu(CH2SiMe3)3(THF)2] with H2L. The monomeric structures of these complexes were confirmed by X-ray diffraction studies, showing distorted octahedral geometry around the metal centre. The reaction of [Lu(tbmp)(CH2SiMe3)(THF)2] (1) with alcohols ROH (R = iPr, CHPh2, CPh3) results in the formation of the corresponding alkoxide complexes [Lu(tbmp)(OR)(THF)n] (4–6). With PhSiH3 hydride complexes [Lu(L)(µ-H)(THF)n]2 (L = tbmp, 7; etbmp, 8) have been prepared in moderate to good yields. They adopt a dimeric form in the solid state as revealed by the X-ray crystal structure of 7. The reactivity of the hydride complexes and their catalytic activity in the ring-opening polymerisation of L-lactide and the hydrosilylation of alkenes are also discussed.
含有硫桥联双酚配体的镥烷基配合物[Lu(L)(CH2SiMe3)(THF)n],如2,2'-硫代双(6-叔丁基-4-甲基酚盐)(L = tbmp,1)或1,4-二硫杂环丁二基双(6-叔丁基-4-甲基酚盐)(L = etbmp,2),由镥三烷基配合物[Lu(CH2SiMe3)3(THF)2]与H2L反应分离得到。这些配合物的单体结构通过X射线衍射研究得到证实,显示金属中心周围扭曲的八面体几何构型。[Lu(tbmp)(CH2SiMe3)(THF)2](1)与醇ROH(R = iPr, CHPh2, CPh3)反应生成相应的烷氧化物配合物[Lu(tbmp)(OR)(THF)n](4-6)。与PhSiH3反应,以中等至良好产率制备了氢化物配合物[Lu(L)(µ-H)(THF)n]2(L = tbmp,7; etbmp,8)。它们在固态中采用二聚形式,正如7的X射线晶体结构所示。还讨论了氢化物配合物的反应性和它们在L-乳酸开环聚合以及烯烃的氢硅化反应中的催化活性。