Molecular engineering of coordination pockets in chloro-tris-phenoxo complexes of titanium(IV)

Molecular engineering of coordination pockets in chloro-tris-phenoxo complexes of titanium(IV)
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钛(IV)氯代三苯氧基配合物中配位袋的分子工程

DOI:
10.1016/j.poly.2005.12.027
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发表时间:
2006
期刊:
影响因子:
2.6
通讯作者:
J. Waters
J. Waters
中科院分区:
化学3区
文献类型:
--
作者:
A. J. Nielson;Chaohong Shen;J. Waters

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通过在甲苯中加热3当量的苯酚和[TiCl 4]来制备氯-三苯氧基络合物[TiCl(OAr)3](OAr= OC 6 H4 CMe 3 -4(1)、OC 6 H3 Me 2 - 2,4(2)、OC 6 H2 Me 3 - 2,4,6(4)、OC 6 H3(CHMe 2)2- 2,6(5)、OC 6 H3(CMe 3)2- 2,4(6)和OC 6 H4 Ph-2(8)。X-射线晶体结构测定表明,2是一个苯氧基桥接的二聚体与邻甲基基团,使口袋周围的终端氯配体的开始和6是一个四面体单体,其中口袋是更好地开发的邻叔丁基基团。2和6与dmbipy反应生成[TiCl(OAr)3(dmbipy)] [OAr= OC 6 H3 Me 2 - 2,4(3)和OC 6 H3(CMe 3)2- 2,4(7)],其中原始口袋被破坏。TiCl_4与3当量LiOC_6 H_4Ph-2在乙醚中反应生成[TiCl(OC_6 H_4Ph-2)_3(乙醚)](9),X射线晶体结构测定表明其为三角双锥配位几何构型,乙醚位于氯配体的反式位置。三个酚盐配体组成赤道平面,其将每个苯氧配体上的2-苯基取代基从氯配体上带走,导致部分塌陷的空腔。2和6的回接类似物[TiCl{(OC 6 H2 Me 2 - 2,4-CH 2 -6)3 N}](11)和[TiCl({OC 6 H2(CMe 3)2- 2,4-CH 2 -6} 3 N)]·二乙醚(12)通过将(HOArCH 2)3 N [Ar= C6 H2 Me 2 - 2,4和C6 H2(CMe 3)22,4]加入到二乙醚中的[TiCl(OCHMe 2)3]来制备。12的X-射线晶体结构显示出与在6中发现的类似的关于末端氯配体的配位环境的三角双锥结构。配合物12与吡啶反应生成六配位配合物[TiCl({OC 6 H2(CMe 3)2- 2,4-CH 2 -6} 3 N)(py)](13)。
The chloro-tris-phenoxo complexes [TiCl(OAr)3] (OAr=OC6H4CMe3-4 (1), OC6H3Me2-2,4 (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 TiCl4with 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)3N}] (11) and [TiCl({OC6H2(CMe3)2-2,4-CH2-6}3N)]·diethyl ether (12), are prepared by adding (HOArCH2)3N [Ar=C6H2Me2-2,4 and C6H2(CMe3)22,4] 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}3N)(py)] (13).
DOI: 10.1021/ic040095w
发表时间: 2005-01
影响因子: 4.6
作者:
D. Yandulov;R. Schrock
通讯作者: D. Yandulov;R. Schrock
DOI: 10.1107/s0108767394005726
发表时间: 1995-01-01
期刊: ACTA CRYSTALLOGRAPHICA SECTION A
影响因子: --
作者:
BLESSING, RH
通讯作者: BLESSING, RH