Anthracene moieties chromophores

Creed et al. [125]. The 2,6-di-substitution pattern was chosen so that the anthracene moiety would be more likely to be elongated and to act as a mesogen. This polymer has an LC mesophase that is most probably N. Evidence was reported for chromophore association in this polymer even when it is highly diluted in a good solvent such as dichloromethane, but spectral perturbations due to aggregation are especially noticeable in films. Aggregation, as evidenced by a strongly blue-shifted band at 235 nm (the isolated chromophore absorbs at... 

The synthesis of a sulfonium salt bearing a photosensitizing anthracene moiety in the same molecule was described by Pappas et al. [PAP 03]. Details of the synthesis of 9 are presented in equation [2.2]. The objective of this work was to improve the efficiency of electron-transfer photosensitization by an intramolecular interaction by incorporating the anthracene within the same sulfonium salt molecule. Indeed, 9 bearing the tetrafluoroborate anion was observed to show excellent activity in the 300 nm region due to the presence of the strongly absorbing anthracene chromophor. 

Intramolecular Photocycloaddition of N—P4—A. Although the photocycloaddition of anthracene [85-100] and that of naphthalene [65-67,80-82] have been extensively studied, until recently relatively little has been reported on the cross-photocycloaddition between an anthracene and a naphthalene moiety [101-110], The main reason for this is the large difference in the quantum yields between the photocycloaddition of anthracene and the cross-photocycloaddition of anthracene and naphthalene. Thus, bichromophoric molecules with anthryl as one chromophore and naphthyl as the other generally undergo intermolecular an-thryl-anthryl cycloaddition rather than intramolecular cross-cycloaddition when irradiated. 

Chromophore quencher systems where the organic molecular components are aryl hydrocarbons are under intense study [67, 190-205], In these systems an inorganic moiety (based on polypyridine complexes of Ru(II), Os(II), Re(I)) and an aryl hydrocarbon (naphthalene, anthracene, pyrene) are covalently linked by flexible aliphatic [187-201] or rigid conjugated bridges [49, 190, 191, 193). 

---