PHOTOISOMERISATION D'ARYLHYDRAZONES-2 DE DICETONES-1,2 SUBSTITUEES EN 2. MECANISME D'ISOMERISATION THERMIQUE DE LA DOUBLE LIAISON C=N

Article abstract of DOI:10.1016/S0040-4020(01)92091-5

A syn-anti photoisomerisation of the carbon-nitrogen double bond is responsible for the photochromic properties observed with 2-arylhydrazones of 2-substituted 1,2-diketones.We have determined the multiplicity of the excited state involved in the process and we have shown that, in the thermal back-reaction, syn-anti isomerisation takes place through rotation around the C=N bond rather than through inversion of the nitrogen atom.