ISSN:
0044-2313
Keywords:
Alkoxy-Alkyne Complexes of Tungsten
;
Synthesis
;
Crystal Structures
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Synthesis and Crystal Structures of the Tungsten(VI)-alkyne Complexes [W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2] and Li[W(OMe)5(Et—Te—C≡C—Te—Et)]The title compounds have been prepared by reactions of lithium methanolate with [WCl4(Et—Se—C≡C—Se—Et)(THF)] and [WCl4(Et—Te—C≡C—Te—Et)(THF)], respectively, in diethylether suspensions. Both complexes were characterized by crystal structure determinations.[W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2]: Space group P1, Z = 2, structure determination with 4 320 observed unique reflections, R = 0.041. Lattice dimensions at -70°C: a = 949.3, b = 1 225.3, c = 1 285.0 pm, α = 82.48°; γ = 82.44°; β = 81.44°. The tungsten atoms are bridged by three μ2-O-atoms of the OMe groups; the alkyne ligands are coordinated side-on in a metallacyclopropene-like fashion.Li[W(OMe)5(Et—Te—C≡C—Te—Et)]: Space group P1, Z = 2, structure determination with 9 381 observed unique reflections, R = 0.038. Lattice dimensions at -70°C: a = 983.4, b = 1606.9, c = 1971.5 pm, α = 66.09°, β = 84.29°, γ = 79.83°. The lithium ions link the [W(OMe)5(Et—Te—C≡C—Te—Et)]- anions to a trimeric ion ensemble via the O atoms of three OMe groups of each anion.
Notes:
Die Titelverbindungen werden durch Reaktion von Lithiummethanolat mit [WCl4(Et—Se—C≡C—Se—Et)(THF)] bzw. mit [WCl4(Et—Te—C≡C—Te—Et)(THF)] in Diethylether hergestellt und durch Kristallstrukturanalysen charakterisiert.[W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2]: Raumgruppe P1, Z = 2, Strukturlösung mit 4 320 beobachteten unabhängigen Reflexen, R = 0,041. Gitterabmessungen bei -70°C: a = 949,3; b = 1225,3; c = 1285,0 pm, α = 82,48°; β = 82,44°; γ = 81,44°. Die beiden Wolframatome sind über drei μ2-OMe-Brücken verknüpft; die Alkinliganden sind seitlich entsprechend von Metallacyclopropengruppen koordiniert.Li[W(OMe)5(Et—Te—C≡C—Te—Et)]: Raumgruppe P1, Z = 2, Strukturlösung mit 9 381 beobachteten unabhängigen Reflexen, R = 0,038. Gitterabmessungen bei -70°C: a = 983,4; b = 1606,9; c = 1971,5 pm, α = 66,09°; β = 84,29°; β = 79,83°. Die Lithiumionen verknüpfen die [W(OMe)5(Et—Te—C≡C—Te—Et)]--Anionen über die O-Atome dreier OMe-Gruppen zu einem trimeren Ionenensemble.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19956210309
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