title: Synthesis, Characterization and Photophysical Studies of Tricoumarin-Pyridines.
abstract: A series of novel tricoumarin-pyridines have been synthesized by the reaction of 4-formyl coumarins and substituted 3-acetylcoumarin with ammonium acetate for the application in organic electronics as well as fluorescent dyes. The structures of all new compounds were confirmed and characterized by IR,1H NMR and ESI-Mass analysis. All the important photo physical prerequisites for organic electronic application such as strong and broad optical absorption, thermal stability were determined for the synthesized molecules. Optical properties were studied by UV-Vis absorption and fluorescence spectroscopy. Optical band gaps of the tricoumarin-pyridines were found to be 2.72-3.10 eV as calculated from their onset absorption edge. The tricoumarin-pyridines were thermally stable up to 290-370 °C as determined by thermogravimetric analysis (TGA). Photophysical studies indicate the synthesized materials are promising candidates for organic electronic applications.
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, 580 003, India.
authors.forename: Nirmala S
authors.initials: NS
authors.lastname: Naik
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, 580 003, India. drlashastri@kud.ac.in.
authors.forename: Lokesh A
authors.initials: LA
authors.lastname: Shastri
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Hanyang University, Seoul, 133-791, Republic of Korea. cdbathula9@gmail.com.|Institute of Nanoscience and Technology, Hanyang University, Seoul, 133-791, Republic of Korea. cdbathula9@gmail.com.
authors.forename: Chinna
authors.initials: C
authors.lastname: Bathula
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, 580 003, India.
authors.forename: Bahubali
authors.initials: B
authors.lastname: Chougala
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, 580 003, India.
authors.forename: Samundeeswari
authors.initials: S
authors.lastname: Shastri
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, 580 003, India.
authors.forename: Megharaja
authors.initials: M
authors.lastname: Holiyachi
authors.affiliation: Department of Chemistry, G.S.S. College, Belagavi, Karnataka, India.
authors.forename: Vinay
authors.initials: V
authors.lastname: Sunagar
keywords: Photophysical studies; Thermogravimetry; Tricoumarins-pyridines; UV-Vis absorption