Abstract
η 5-6- N-Dimethylamino-2,3-benzofulvenchromium tricarbonyl has been synthesized. The rotational isomerism of the complex and the parent fulvene and the kinetic parameters of the barriers to rotation about the ▪ bond have been determined by dynamic 1H NMR spectroscopy. π-Coordination increases the free energy of the rotational barrier, i.e. increases the degree of double-bond character between the C(6) and N atoms and, hence, enhances the π-electron polarization of the exocyclic double bond. Electron impact mass spectra of the complex and the parent fulvene have been investigated.
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