W2Cl4(NR2)(2)(PR3')(2) molecules .9. New mixed valent W-III/W-IV face-sharing bioctahedral complexes with chelating bis(diphenylphosphino)propane and dialkylamido ligands

被引：5
作者：
Cotton, FA [1 ]
Dikarev, EV [1 ]
Wong, WY [1 ]
机构：
[1] TEXAS A&M UNIV, MOL STRUCT & BONDING LAB, COLLEGE STN, TX 77843 USA
来源：
POLYHEDRON | 1997年 / 16卷 / 22期
关键词：
tungsten complexes; face-sharing bioctahedral complexes; bis(diphenylphosphino)propane complexes; chelating diphosphine ligand; crystal structure;
D O I：
10.1016/S0277-5387(97)00216-7
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The triply-bonded ditungsten(III) species trans,trans-W2Cl4(NBu2n)(2)(dppp) (1) and a new mixed-valent W-III/W-IV complex (dppp) ClW(mu-Cl)(3)WCl2(NBu2n) (3) have been isolated from the reaction of W2Cl4 (NBu2n)(2)(NHBu2n)(2) with 1,3-bis(diphenylphosphino)propane (dppp). A complex similar to 3, (dppp)ClW(mu-Cl)(3)WCl2(NEt2) (2), has also been prepared. Both 2 and 3 are characterized by a W-2(7+) core and they adopt face-sharing bioctahedral geometry with a chelating dppp ligand. The W-W distances in 2 and 3 are both 2.660(1) Angstrom and each of them shows an EPR signal at g = 1.88. The structure of 1 contains a W-2(6+) core with a W-W distance of 2.3055(8) Angstrom. It has a bridging dppp ligand and a trans,trans stereochemistry. (C) 1997 Elsevier Science Ltd.
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页码：3893 / 3898
页数：6
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