Slackening a chromium carousel with a manganese bridle: selective 13C isotopic labelling applied to the determination of the steric barrier to rotation of a Cr(CO)3 group in a syn -facial hetero-bimetallic (Cr, Mn) cyclohexadienylbenzylidene complex
Identifieur interne : 003431 ( Istex/Checkpoint ); précédent : 003430; suivant : 003432Slackening a chromium carousel with a manganese bridle: selective 13C isotopic labelling applied to the determination of the steric barrier to rotation of a Cr(CO)3 group in a syn -facial hetero-bimetallic (Cr, Mn) cyclohexadienylbenzylidene complex
Auteurs : Jean-Pierre Djukic [France] ; Michel Pfeffer [France] ; Karl Heinz Dötz [Allemagne]Source :
- Comptes Rendus de l'Academie des Sciences Series IIC Chemistry [ 1387-1609 ] ; 1999.
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Abstract
The steric barrier to rotation ΔG‡ of the Cr(CO)3 rotor of a syn-facial heterobimetallic cyclohexadienylbenzylidene (Cr, Mn) complex has been determined by 13C-NMR low-temperature experiments. The latter compound was prepared from a (η6-arene)tricarbonylchromium complex isotopically enriched in 13C by photolytic mono-decarbonylation and carbonylation with labelled CO. This 13C dynamic NMR study presents the first example of the freezing of the rotational motion of Cr(CO)3 that takes place at moderately low temperatures (‡G‡253 K = 15 kcal·mol−1).
Url:
DOI: 10.1016/S1387-1609(00)88552-7
Affiliations:
- Allemagne, France
- Alsace, Alsace-Champagne-Ardenne-Lorraine, District de Cologne, Rhénanie-du-Nord-Westphalie
- Bonn, Strasbourg
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ISTEX:25BB9F5F89E3ECA62618230548ACDD2743DCF3CBLe document en format XML
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a syn-facial heterobimetallic cyclohexadienylbenzylidene (Cr, Mn) complex has been determined by 13C-NMR low-temperature experiments. The latter compound was prepared from a (η6-arene)tricarbonylchromium complex isotopically enriched in 13C by photolytic mono-decarbonylation and carbonylation with labelled CO. 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