title: Photoinduced intramolecular charge transfer phenomena in 5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid.
abstract: A donor acceptor substituted aromatic system 5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid (DMAPPDA) has been synthesized and its spectral properties have been explored on the basis of steady state absorption and fluorescence spectroscopy. Spectral features point largely towards a possible occurrence of photoinduced intramolecular charge transfer process from the donor NMe2 group to the acceptor acid group. Solvent dependency of the large Stokes' shifted emission band and the calculated large excited state dipole moment support the polar character of the charge transfer excited state. Quantum yield calculations and effect of addition of acid and base on the steady state spectra were also performed to further scrutinize the excited state CT character.
authors.affiliation: Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India.
authors.forename: Sankar
authors.initials: S
authors.lastname: Jana
authors.forename: Shalini
authors.initials: S
authors.lastname: Ghosh
authors.forename: Sasanka
authors.initials: S
authors.lastname: Dalapati
authors.forename: Samiran
authors.initials: S
authors.lastname: Kar
authors.forename: Nikhil
authors.initials: N
authors.lastname: Guchhait
mesh_terms: D000042:Absorption; D008027:Light; D008744:Methylamines / Q000737:chemistry; D008968:Molecular Conformation; D009828:Oleanolic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D010421:Pentanoic Acids / Q000737:chemistry*; D011789:Quantum Theory; D012972:Sodium Hydroxide / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D055672:Static Electricity; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature
chemical_list: C557122:5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid; D008744:Methylamines; D010421:Pentanoic Acids; D012997:Solvents; D013464:Sulfuric Acids; D012972:Sodium Hydroxide; D009828:Oleanolic Acid; C023336:trimethylamine; C033158:sulfuric acid