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)
复制标题
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
复制
发表时间:
2006
期刊:
影响因子:
2.6
通讯作者:
J. Waters
中科院分区:
文献类型:
--
作者:
A. J. Nielson;Chaohong Shen;J. Waters
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).
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