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The photophysical behavior of a homologous series of amphiphilic hemicyanines, incorporated in thin films, made by dip-coating glass slides in bis(2-ethylhexyl)sulfosuccinate sodium salt (AOT) reverse micellar solutions, has been studied by absorption spectrophotometry and computer simulation techniques. At relatively high dye concentration, a narrow band in the absorption spectrum was observed, corresponding...
The properties of Frenkel excitons in columnar mesophases are analysed using numerical calculations with a particular emphasis on the off-diagonal disorder induced by rotation of the molecular disks around the column axis. The influence of degeneracy of the molecular electronic transitions and the effect of the chromophore size are illustrated by means of the extended dipole model. The localisation/delocalisation...