Molecular structure of 2,2'-thiobis(4-methyl-6-tert-butylphenoxy) titanium diisopropoxy. Influence of titanium-sulfur interaction on coordination geometry

被引：82

作者：

Porri, L ^{[1
]}

Ripa, A ^{[1
]}

Colombo, P ^{[1
]}

Miano, E ^{[1
]}

Capelli, S ^{[1
]}

Meille, SV ^{[1
]}

机构：

[1] POLITECN MILAN,DIPARTIMENTO CHIM,I-20133 MILAN,ITALY

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1996年 / 514卷 / 1-2期

关键词：

titanium; 2,2'-thiobisphenoxy ligand; sulfur; sulfide; X-ray structure; Ti-S interaction;

D O I：

10.1016/0022-328X(95)06021-N

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The molecular structure of 2,2'-thiobis(4-methyl-6-tert-butylphenoxy) titanium diisopropoxy (la) has been determined, The molecule exists as a dimer, in which the 1,3-dioxadititanacycle is supported by two bridging (i)Pro ligands. The coordination environment about each Ti center is best described as a distorted octahedron, where the S atom and one (i)Pro ligand occupy the axial positions, whilst two terminal phenolate and two bridging (i)Pro ligands occupy the equatorial sites, The eight-membered dioxatitanacycle adopts a symmetric-syn boat conformation, which allows for a significant sulfur-titanium interaction (S-Ti distance 2.724(2) Angstrom). A comparison between these structural features and those reported for the monomeric tetrahedral complexes 2b and 2d, where the sulfur atom is replaced by a methylene bridge in the bisphenoxy ligand, highlights the influence of the S-Ti interaction on coordination geometry, The structural features suggested for 1a to account for the higher catalytic activity of 1a/MAO in polymerization of alpha-olefins as compared with 2a/MAo are clearly demonstrated.

引用

页码：213 / 217

页数：5

共 38 条

[1] COMPLETION AND REFINEMENT OF CRYSTAL-STRUCTURES WITH SIR92 [J].