Substituent effects in the formation of aryloxide-bridged europium complexes

被引：37

作者：

Evans, WJ

Greci, MA

Ziller, JW

机构：

[1] Department of Chemistry, University of California, Irvine

来源：

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 1997年 / 17期

关键词：

D O I：

10.1039/a702639k

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reactivity of europium in liquid ammonia with 2,6-disubstituted phenols has been surveyed and the effect of the 2,6 substituents on the bridging ability of the aryloxides has been examined. Monomeric and tetrameric complexes of Eu-II have been isolated with tert-butyl and isopropyl substituents, Eu(OC6H3Bu2t-2,6)(2)(NCMe)(4) 1 and Eu-4(mu-OC6H3Pr2i-2,6)(4)(OC6H3Pr2i-2,6)(2)(mu(3)-OH)(2)(NCMe)(6) 2, respectively, which can be compared to the previously reported bimetallic complex, (dme)(2)Eu(mu-OC6H3Me2-2,6)(3)Eu(OC6H3Me2-2,6)(dme) 3, isolated with methyl substituents (dme = 1,2-dimethoxyethane). Acetonitrile has been found to be an excellent solvating ligand for the formation of crystalline complexes in this series. Complex 1 crystallizes from acetonitrile in the monoclinic space group P2(1)/c with a = 11.7117(14), b = 17.616(2), c = 18.263(2) Angstrom, beta = 91.318(8)degrees, U = 3766.8(7) Angstrom(3) and D-c = 1.282 Mg m(-3) for Z = 4. Complex 2 crystallizes from acetonitrile in the monoclinic space group P2(1)/n with a = 13.676(3), b = 20.325(4), c = 32.632(6) Angstrom, beta = 91.068(12)degrees, U = 9069(3) Angstrom(3) and D-c = 1.429 Mg m(-3) for Z = 4.

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页码：3035 / 3039

页数：5

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