Structural studies of mono(pentamethylcyclopentadienyl)-lanthanide complexes
Journal
Journal of Coordination Chemistry
Journal Volume
59
Journal Issue
10
Pages
1069-1087
Date Issued
2006
Author(s)
Evans, W.J.
Champagne, T.M.
Davis, B.L.
Allen, N.T.
Nyce, G.W.
Johnston, M.A.
Khvostov, A.
Ziller, J.W.
Abstract
The mono(pentamethylcyclopentadienyl) lanthanide complexes [(C 5 Me 5 )Yb(μ -I)(μ - η 5 : η 5 -C 5 Me 5 )Yb(C 5 Me 5 )] n (1), {[(C 5 Me 5 )Sm] 3 (μ -Cl) 4 (μ 3 -Cl)(μ 3 -OH)(THF)} 2 (2), {[(C 5 Me 5 )Sm] 2 (μ -OH)(μ -Cl) 4 (μ 3 -Cl)Mg(THF) 2 } 2 (3), [(C 5 Me 5 ) 2 Sm](μ -Cl) 6 (μ 3 -Cl) 2 (μ 4 -Cl)[(C 5 Me 5 )Sm] 4 (4), {[(C 5 Me 5 )Nd] 3 (μ 3 -Cl) 4 (μ 4 -Cl) 2 (μ 3 -O 2 CPh) 2 K 2 (η 6 -C 7 H 8 )} 2 (5), [(C 5 Me 5 )Nd(C 8 H 8 )] 2 (μ -dioxane) (6), [(C 5 Me 5 )Yb(MeO t Bu)] 2 (μ - η 8 : η 8 -C 8 H 8 ) (7), [(C 5 Me 5 )Dy(μ -I) 2 ] 3 (8), and [(C 5 Me 5 ) Tm(MeCN) 6 ]I 2 (9), have been identified by X-ray crystallography. 1 is unusual in that it has a μ - η 5 : η 5 -C 5 Me 5 ring that generates a local bent metallocene environment around ytterbium. Complexes 2-5 demonstrate the versatility of bridging chlorides in generating a variety of structures for mono(pentamethylcyclopentadienyl) lanthanide halides. Complex 6 shows how dioxane can generate a crystallographically-analyzable complex by bridging two mixed-ligand metallocene units that do not readily crystallize with THF. The structure of 7 shows how methyl tert-butyl ether (MTBE) ligates a lanthanide. Complex 8 is a trimeric cyclopentadienyl lanthanide halide unusual in that it has six bridging halides that roughly define a trigonal prism. Complex 9 constitutes an organometallic example of a lanthanide in which acetonitrile completely displaces iodide counterions. © 2006 Taylor & Francis.
Type
journal article