• Ph Cazeau

      Articles written in Journal of Chemical Sciences

    • Hydrogen bonding and TICT molecules in ground state

      C Cazeau-Dubroca A Peirigua M Ben Brahim G Nouchi Ph Cazeau

      More Details Abstract Fulltext PDF

      A comparative absorption study between the flexible molecule and its blocked homologue confirms that the twist around the C−N bond, in the ground state of “anilines” in solution is the common origin of the anomalous temperature effects:

      • the collapse of the second electronic band for N,N-dialkylanilines;

      • the anomalous red shift (ARS) of the first band forp-substituted N,N-dialkylanilines.

      This twist is due to the complexation by hydrogen bonding between “anilines” and traces of water present as impurity in the aprotic solvents.

      Similar twisted complexes- and hence similar anomalies—are obtained, at room temperature, in rigid hydrogen-bonded matrices, such as polyvinyl-alcohol (PVA), in both cases (N,N-dialkylanilines andp-substituted N,N-dialkylanilines).

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