Steric and electronic influences in Os3(CO)11(PR3) structures

被引：30

作者：

Biradha, K

Hansen, VM

Leong, WK

Pomeroy, RK ^{[1
]}

Zaworotko, MJ

机构：

[1] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada

[2] St Marys Univ, Dept Chem, Halifax, NS B3H 3C3, Canada

[3] Natl Univ Singapore, Singapore 119260, Singapore

来源：

JOURNAL OF CLUSTER SCIENCE | 2000年 / 11卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

osmium; cluster; carbonyl; phosphine; trans influence;

D O I：

10.1023/A:1009037404690

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structures of Os-3(CO)(11)(PR3) with R = F, OPh, Et, p-C6H4Me, o-C6H4Me, p-C6H4(CF3) and C6H11, and with PR3 = P(OCH2)(3)CMe have been determined. The Os-Os bond lengths in these compounds are compared to the Os-Os lengths for the other structures of Os-3(CO)(11)(PR3) clusters reported in the literature. In most cases, the Os-Os bond length remote from the P ligand [range, 2.8666(4)-2.9044(4) A] and that in the pseudo-trans position [range, 2.8712(5)-2.900(1) A] show little variation as the steric and electronic properties of the P ligand are varied. The Os-Os length cis to PR3 shows more variation [range, 2.879(1)-2.9429(4) A] and is sensitive to both the size and the sigma-donor/pi-acceptor properties of the PR3 ligand: larger or better donor PR3 ligands cause an increase in the Os-Os bond length. The Os-P distances [range, 2.15(2)-2.478(1) A] show a similar dependence on the steric and electronic properties of the PR3 ligand.

引用

页码：285 / 306

页数：22

共 57 条

[1] EFFECTS OF LIGAND SUBSTITUTION ON THE METAL METAL-BONDING IN TRIOSMIUM CARBONYL CLUSTERS - THE CRYSTAL AND MOLECULAR-STRUCTURES OF OS3(MU-3S)2(CO)9 AND OS3(MU-3-S)2(CO)8PME2PH [J].