Issue 1, 1979

Alkyl-bridged complexes of the d- and f-block elements. Part 2. Bis[bis(η-cyclopentadienyl)methylmetal(III)] complexes, and the crystal and molecular structure of the yttrium and ytterbium species

Abstract

The reaction of [(η-C5H5)2MMe2AlMe2](M = Y, Dy, Ho, Er, Tm, or Yb) and pyridine in equimolar amounts gives a series of complexes [{M(η-C5H5)2Me}2] assigned a dimeric structure on the basis of 1H and 13C n.m.r. (M = Y) and i.r. data, and by crystal and molecular structural determinations of [{M(η-C5H5)2Me}2](M = Y or Yb). A similar reaction of [(η-C5H5)2ScMe2AlMe2] with a Lewis base L gives [Sc(η-C5H5)2Me(L)](L = pyridine or tetrahydrofuran). Other reactions described are of [{Y(η-C5H5)2Me}2] with Lewis bases (an amine, phosphine, or phosphine oxide) or with a Lewis acid [Al2MenCl6 –n](n= 2, 4, or 6). A single-crystal X-ray analysis of the isostructural [{M(η-C5H5)2Me}2] has been carried out to R 0.048 (Y) or 0.066 (Yb) and R′ 0.055 (Y) or 0.061 (Yb); the complexes have an approximately tetrahedral metal environment (space group P21/n) with the YMe2Y unit in the yttrium complex remarkably similar to AlMe2Al in [Al2Me6]. Important average bond lengths (Å) and angles for the yttrium complex (Yb in parentheses) are: Y–C (cyclopentadienyl) 2.655(18)[2.613(13)] and Y–Me 2.545(11)[2.511(35)]; Y–C–Y 87.7(3)[86.6(3)] and Me–Y–Me 92.3(3)[93.4(4)].

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1979, 54-61

Alkyl-bridged complexes of the d- and f-block elements. Part 2. Bis[bis(η-cyclopentadienyl)methylmetal(III)] complexes, and the crystal and molecular structure of the yttrium and ytterbium species

J. Holton, M. F. Lappert, D. G. H. Ballard, R. Pearce, J. L. Atwood and W. E. Hunter, J. Chem. Soc., Dalton Trans., 1979, 54 DOI: 10.1039/DT9790000054

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