title: 3-(7-Dimethylamino)coumarin N-phenylsemicarbazones in solution and polymer matrices: Tuning their fluorescence via para-phenyl substitution.
abstract: The photo-physical properties of five new para-phenyl substituted derivatives of 3-(7-dimethylamino)coumarin N-phenylsemicarbazone with various electron-withdrawing substituents R (RF, Br, CF3, CN or NO2) in the para-position on the phenyl ring were investigated in solvents and in polymer matrices. Tuning their fluorescent properties via para-substitution is discussed in terms of Twisted Intra-molecular Charge-Transfer (TICT) state formation, specific solute-solvent interactions (hydrogen bonding), fluorescent H-aggregates formation, and the solvent polarity and polymer matrix effects.
authors.affiliation: Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovakia. Electronic address: cigan@fns.uniba.sk.
authors.forename: Marek
authors.initials: M
authors.lastname: Cigáň
authors.affiliation: Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia. Electronic address: upoldan@savba.sk.
authors.forename: Martin
authors.initials: M
authors.lastname: Danko
authors.affiliation: Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovakia. Electronic address: donovalova@fns.uniba.sk.
authors.forename: Jana
authors.initials: J
authors.lastname: Donovalová
authors.affiliation: Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovakia. Electronic address: gaspar@fns.uniba.sk.
authors.forename: Jan
authors.initials: J
authors.lastname: Gašpar
authors.affiliation: Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovakia.
authors.forename: Henrieta
authors.initials: H
authors.lastname: Stankovičová
authors.affiliation: Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovakia. Electronic address: gaplovsky@fns.uniba.sk.
authors.forename: Anton
authors.initials: A
authors.lastname: Gáplovský
authors.affiliation: Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia. Electronic address: upolhrdl@savba.sk.
authors.forename: Pavol
authors.initials: P
authors.lastname: Hrdlovič
mesh_terms: D000586:Amination; D003374:Coumarins / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006860:Hydrogen Bonding; D008745:Methylation; D011108:Polymers / Q000737:chemistry; D012664:Semicarbazones / Q000737:chemistry*; D012997:Solvents; D013050:Spectrometry, Fluorescence
chemical_list: D003374:Coumarins; D005456:Fluorescent Dyes; D011108:Polymers; D012664:Semicarbazones; D012997:Solvents
keywords: 3-(7-Dimethylamino)coumarin N-phenylsemicarbazones; Fluorescent H-aggregates; Para-phenyl substitution; Solvent polarity and polymer matrix effects; TICT excited state; Tuning of fluorescent properties