title: Tetraphenylethene-2-Pyrone Conjugate: Aggregation-Induced Emission Study and Explosives Sensor.
abstract: Design and synthesis of a novel tetraphenylethene-2-pyrone (TPEP) conjugate exhibiting donor-acceptor characteristics is reported. The localized frontier molecular orbitals (DFT studies) and the solvent polarity dependent photoluminescence characteristics directly corroborate the presence of intramolecular charge transfer character in TPEP. TPEP is poorly emissive in the solution state. In contrast, upon aggregation (THF/water mixtures), TPEP exhibits aggregation-induced emission enhancement. Upon aggregation, dyad TPEP forms a fluorescent nanoaggregate which was confirmed by transmission electron microscopy imaging studies. The luminescence nanoaggregates were elegantly exploited for selective detection of nitro aromatic compounds (NACs). It was found that nanoaggregates of TPEP were selectively sensing the picric acid over the other NACs. Efficiency of the quenching process was further evaluated by the Stern-Volmer equation. TPEP-based low-cost fluorescent test strips were developed for the selective detection of picric acid.
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University , Madurai 625 021, India.
authors.forename: Vaithiyanathan
authors.initials: V
authors.lastname: Mahendran
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University , Madurai 625 021, India.
authors.forename: Kamaraj
authors.initials: K
authors.lastname: Pasumpon
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University , Madurai 625 021, India.
authors.forename: Solaimalai
authors.initials: S
authors.lastname: Thimmarayaperumal
authors.affiliation: Department of Inorganic and Physical Chemistry, Indian Institute of Science , Bangalore 560 012, India.
authors.forename: Pakkirisamy
authors.initials: P
authors.lastname: Thilagar
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University , Madurai 625 021, India.
authors.forename: Sivakumar
authors.initials: S
authors.lastname: Shanmugam