Crystal structures and luminescence properties of osmium complexes of cis-1,2-vinylenebis(diphenylarsine) and pyridyl ligands:: Possible evidence for metal d, ligand d backbonding

被引：12

作者：

Carlson, B ^{[1
]}

Phelan, GD ^{[1
]}

Benedict, JB ^{[1
]}

Kaminsky, W ^{[1
]}

Dalton, L ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

INORGANICA CHIMICA ACTA | 2006年 / 359卷 / 04期

关键词：

As ligands; bond theory; osmiurn complexes; phosphane ligands; X-ray crystal structures;

D O I：

10.1016/j.ica.2005.11.024

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Divalent osmium complexes of the form [Os(N-N)(2)L-L](PF6-)(2) where N-N was a polypyridyl, and L-L was either cis-1,2-bis(diphenylphosphino)ethene (dppene) or cis-1,2-vinylenebis(diphenylarsine) (dpaene) have been synthesized and characterized. X-ray structures were determined for three complexes and for the free dpaene molecule. It was observed that the P-C bond lengths, and C-P-C bond angles do not change significantly when complexed to osmium. It was observed the As-C bond lengths shorten by 2.3 pm and the C-As-C bond angles broaden by 5.6 degrees when dpaene was complexed to osmium. These changes in the arsine structure may indicate a different method of backbonding between arsenic and osmium. It was found that the arsine complexes had absorption and emission that were to the red of analogous phosphine complexes. In violation of "energy gap law"', the dpaene complexes were found to have higher quantum yields. This may be due to the way that the arsenic atoms bond to osmium. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1093 / 1102

页数：10

共 65 条

[1] High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials [J].