STRUCTURE OF THE UNREACTIVE HINDERED CYCLOPENTADIENYLZIRCONIUM COMPOUND [C5H2(SIME3)3]2ZRCL2

被引：20

作者：

CHOUKROUN, R ^{[1
]}

DAHAN, F ^{[1
]}

机构：

[1] INST NATL POLYTECH TOULOUSE, F-31077 TOULOUSE, FRANCE

来源：

ORGANOMETALLICS | 1994年 / 13卷 / 05期

关键词：

D O I：

10.1021/om00017a079

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The title compound crystallizes from hexane in space group Pna2(1) with cell parameters a = 42.700(3) angstrom, b = 17.484(2) angstrom, c = 10.946(l) angstrom, Z = 8, R = 0.046, and R(omega) = 0.053. In the crystal, monomeric units are observed with the tris(trimethylsilyl)cyclopentadienyl rings staggered due to steric congestion at the metal, to form a Cp(centroid)-Zr-Cp(centroid) angle of 135.4(2)-degrees and relatively short Zr-Cl bond lengths of 2.420(3) and 2.438-(3) angstrom (133.7(2)-degrees, 2.415(3) angstrom, and 2.421(3) angstrom, respectively, in a second independent molecule). Following chemical reduction of 1 with sodium amalgam (Na/Hg), there is ESR evidence for Zr(III) species (g = 1.936 in toluene; g = 1965 in THF, as the ligand adduct), whereas electrochemical reduction was not observed by cyclic voltammetry up to 40 V/s. No reaction occurs between 1 and LiAlH(OCMe3), LiAlH4, NaAlH2(OCH2CH2OCH3)2, LiMe, and LiBH4, probably due to the steric effect of the hindered tris(trimethylsilyl)cyclopentadienyl rings.

引用

页码：2097 / 2100

页数：4

共 28 条

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