Aggregation phenomena in photobicyclised pyridinium salts. (7th November 2017)

• Record Type: Journal Article
• Authors: Aracena, A.; Rezende, M. C.; Encinas, M. V.; Vergara, C.; Vásquez, S. O.
• Is Part Of: New journal of chemistry. Volume 41:Number 23(2017)
• Page Start: 14589
• Page End: 14594
• Publication Date: 2017-11-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj02788e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Absorption and emission spectra of PQPBF4 and BPDTQClO4 in water provide evidence, supported by theoretical calculations, of H-aggregation in this solvent. Abstract : The possible formation of aggregates in a solution of two planar heterocyclic salts, 2-phenylbenzo[8, 9]quinolizino[4, 5, 6, 7- fed ]phenanthridinylium tetrafluoroborate (PQPBF4 ) and thienyl-substituted 2-phenylbenzo[ ij ]pyrido[2, 1, 6- de ]dithieno[3, 2- b :2′, 3′- g ]quinolizin-13-ium perchlorate (BPDTQClO4 ), was investigated in organic solvents and in water, by the analysis of their UV-Vis and fluorescence spectra. The results provided evidence for the formation of H-aggregates in water, a conclusion supported by theoretical calculations of the transition energies of the cationic monomers (PQP + and BPDTQ + ) and of the dicationic π-stacked H-dimers in water.