New intramolecular exciplexes between polynuclear aromatic hydrocarbons and head-to-head vs head-to-tail photodimerization of mesosubstituted anthracenes.
New dissymetrical non conjugated bichromophores linked by an oxygenated chain: (9-anthrylmethyloxymethyl)arenes[arenes:benzene(Ia),2-naphthalene(Ib),9-phenanthrene (Ic) and 1-pyrene (Id) and (9-phenanthrylmethyloxymethyl)-1-pyrene (II)] have been prepared. Ic–d and II exhibit intramolecular exciplex fluorescence in methylcyclohexane at room temperature. Intramolecular photoadducts were not found but