Two derivatives of lithium isodicyclopentadienide: [(1,2,3,3a,7a-eta)-4,5,6,7-tetrahydro-4,7-methanoindenido] (N,N,N1,N1-tetramethylethylenediamine)lithium and Bis (1,4,7,10-tetraoxacyclododecane)-lithium(1+) Bis[(1,2,3,3a,7a-eta)-4,5,6,7-tetrahydro-4,7-methanoindenido]lithate(1- )

Autor: J C, Gallucci, M R, Sivik, L A, Paquette, F, Zaegel, P, Meunier, B, Gautheron
Rok vydání: 1996
Předmět:
Zdroj: Acta crystallographica. Section C, Crystal structure communications. 52
ISSN: 0108-2701
Popis: Selective crystallization of a solution of lithium isodicyclopentadienide, (isodiCp)Li, in dry thf or diethyl ether under argon has produced two lithium complexes: (isodiCp)Li(TMEDA), [Li(C10H11)(C6H16N2)], (4), and [Li(12-crown-4)2]+. [Li(isodiCp)2]-, [Li(C8H16O4)2]-[Li(C10H11)2], (5). In (4) the Li+ ion is coordinated to the two N atoms of the disordered TMEDA and is eta 5-coordinated to the Cp ring of the isodiCp ligand. The Li-(Cp ring centroid) distance is 1.906 (7) A. In (5) there are two independent half-molecules of the anion and one molecule of the cation in the asymmetric unit. In each anion, the Li+ ion occupies a crystallographic inversion center and is eta 5-coordinated to the two Cp rings of two isodiCp ligands. The Cp rings are in a staggered arrangement, as required by the inversion center. The Li-(Cp ring centroid) distances for the two anions are 1.987 (3) and 2.008 (3) A. In the cation of (5), the Li+ ion is coordinated to two 12-crown-4 ligands, one of which is disordered. Both (4) and (5) exhibit exo coordination of the Li+ ion to the isodiCp ligand, with a resultant slight endo bending of this ligand.
Databáze: OpenAIRE
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