title: Optical properties of 1-(4,5-diphenyl-1-p-tolyl-1H-imidazol-2-yl)naphthalen-2-ol--ESIPT process.
abstract: This article presents optical, electrochemical, and thermal properties of novel class of green fluorescent 1-(4,5-diphenyl-1-p-tolyl-1H-imidazol-2-yl)naphthalen-2-ol. Detailed photo physical and quantum chemical studies have been performed to elucidate the excited state intramolecular proton transfer (ESIPT) reaction leading a large stokes shifted fluorescence emission from the phototautomer. The results of quantum chemical investigations confirmed the intramolecular charge transfer characteristics of the ESIPT tautomers. The high photoluminescence quantum yield is ascribed to twisted chromophores due to phenyl substituents at 1,2-position of the imidazole ring which restricted intramolecular motion, leading to an optically allowed lowest optical transition without self quenching.
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India. Electronic address: jtchalam2005@yahoo.co.in.
authors.forename: J
authors.initials: J
authors.lastname: Jayabharathi
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.
authors.forename: V
authors.initials: V
authors.lastname: Thanikachalam
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.
authors.forename: V
authors.initials: V
authors.lastname: Kalaiarasi
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.
authors.forename: K
authors.initials: K
authors.lastname: Jayamoorthy
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D011522:Protons; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001713:Biphenyl Compounds; D007093:Imidazoles; D009281:Naphthalenes; D011522:Protons; C010574:biphenyl; C029899:imidazole
keywords: ESIPT; HOMO LUMO; Intramolecular charge transfer; MEP