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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Molecular engineering of coordination pockets in chloro-tris-phenoxo complexes of titanium(IV)
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Molecular engineering of coordination pockets in chloro-tris-phenoxo complexes of titanium(IV)

机译:钛(IV)的氯-三-苯氧基配合物配位口袋的分子工程

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摘要

The chloro-tris-phenoxo complexes [TiCl(OAr)(3)] (OAr = OC6H4CMe-(3)-4 (1). OC6H2Me3-2A (2). OC6H2Me3-2,4,6 (4), OC6H3(CHMe2)(2)-2,6 (5), OC6H3(CMe3)(2)-2,4 (6) and OC6H4Ph-2 (8) are prepared by heating 3 equivalents of the phenol and [TiCl4] in toluene. X-ray crystal structure determinations show that 2 is a phenoxy-bridged dimer with the ortho-methyl groups making the beginning of a pocket about the terminal chloro ligand and 6 is a tetrahedral monomer in which the pocket is more well developed by the ortho-tert-butyl groups. Both 2 and 6 react with dmbipy to give [TiCl(OAr)(3)(dmbipy)] [OAr = OC6H3Me2-2,4 (3) and OC6H3(CMe3)2-2,4 (7)] in which the original pocket is destroyed. Reaction of TiCl4 with 3 equivalents of LiOC6H4Ph-2 in diethyl ether gives [TiCl(OC6H4Ph-2)(3)(diethyl ether)] (9) for which an X-ray crystal structure determination shows a trigonal bipyramidal coordination geometry with the diethyl ether lying trans to the chloro ligand. The three phenoxide ligands make up the equatorial plane which takes the 2-phenyl substituent on each phenoxo ligand away from the chloro ligand resulting in a partially collapsed cavity. The tied-back analogues of 2 and 6, [TiCl{OC6H2Me2-2,4-CH2-6)(3)N)] (11) and [TiCl({OC6H2(CMe3)(2)-2,4-CH2-6}(3)N)] (.) diethyl ether (12), are prepared by adding (HOArCH2)(3)N [Ar = C6HMe2-2,4 and C6H2(CMe3)(2) 2.4] to [TiCl(OCHMe2)(3)] in diethyl ether. An X-ray crystal structure of 12 showed a trigonal bipyramidal structure with a coordination environment about the terminal chloro ligand similar to that found in 6. Complex 12 reacts with pyridine to form the 6-coordinate complex [TiCl{OC6H2(CMe3)(2)-2,4-CH2-6)(3)N)(py)] (13). (c) 2006 Elsevier Ltd. All rights reserved.
机译:氯-三-苯氧基络合物[TiCl(OAr)(3)](OAr = OC6H4CMe-(3)-4(1)。OC6H2Me3-2A(2)。OC6H2Me3-2,4,6(4),OC6H3(通过在甲苯中加热3当量的苯酚和[TiCl4],制备CHMe2)(2)-2,6(5),OC6H3(CMe3)(2)-2,4(6)和OC6H4Ph-2(8)。 X射线晶体结构测定表明2是苯氧基桥连的二聚体,其邻甲基在末端氯配体周围形成口袋,而6是四面体单体,其中该口袋更容易被邻位甲基显影。叔丁基基团2和6都与苯丙基反应生成[TiCl(OAr)(3)(dmbipy)] [OAr = OC6H3Me2-2,4(3)和OC6H3(CMe3)2-2,4(7) TiCl4与3当量的LiOC6H4Ph-2在乙醚中的反应生成[TiCl(OC6H4Ph-2)(3)(二乙醚)](9),通过X射线晶体结构测定显示了一个三角形的双锥体配位几何结构,其中的二乙基醚反位到氯配体,三个酚盐配体组成t赤道平面使每个苯氧配位体上的2-苯基取代基离开氯配体,导致空腔部分塌陷。绑定的类似物2和6,[TiCl {OC6H2Me2-2,4-CH2-6)(3)N)](11)和[TiCl({OC6H2(CMe3)(2)-2,4-CH2通过将(HOArCH2)(3)N [Ar = C6HMe2-2,4和C6H2(CMe3)(2)2.4]添加到[TiCl]中来制备-6}(3)N)](。)二乙醚(12) (OCHMe2)(3)]在乙醚中的溶液。 X射线晶体结构12显示为三角双锥体结构,其末端氯配体的配位环境与6中相似。配位化合物12与吡啶反应形成6配位配合物[TiCl {OC6H2(CMe3)(2 )-2,4-CH2-6)(3)N)(py)](13)。 (c)2006 Elsevier Ltd.保留所有权利。

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