Journal ArticleDOI
Photophysical Properties of Intramolecular Charge-Transfer Excited Singlet State of Aminofluorenone Derivatives
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In this paper, the photophysical properties of fluorenone and 12 aminofluorenone derivatives were investigated systematically by fluorescence quantum yield and picosecond lifetime measurements in cyclohexane, benzene and benzene.Abstract:
Photophysical properties of fluorenone and 12 aminofluorenone derivatives were investigated systematically by fluorescence quantum yield and picosecond lifetime measurements in cyclohexane, benzene...read more
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Direct Photocatalyzed Hydrogen Atom Transfer (HAT) for Aliphatic C-H Bonds Elaboration
TL;DR: A comprehensive review of the synthetic applications of photocatalyzed d-HAT can be found in this article, where the authors provide a comprehensive overview of the main applications of PCHAT.
Journal ArticleDOI
Ultrafast intermolecular hydrogen bond dynamics in the excited state of fluorenone
Vaishali Samant,Arun K. Singh,Guda Ramakrishna,Hirendra N. Ghosh,Tapan K. Ghanty,Dipak K. Palit +5 more
TL;DR: In this paper, a comparison of the features of the steady-state fluorescence spectra of fluorenone in various kinds of media demonstrates that two spectroscopically distinct forms of fluornone in the S 1 state, namely the non-hydrogen-bonded (or free) molecule as well as the hydrogen-bunded complex, are responsible for the dual-fluorescence behavior of fluorescence behavior of normal alcoholic solvents at room temperature (298 K).
Journal ArticleDOI
Urea-based ruthenium (II)-polypyridyl complex as an optical sensor for anions: Synthesis, characterization, and binding studies
TL;DR: Narrowing of the gap between the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels on deprotonation of the receptor molecule caused a faster decay of the luminescence lifetime for the Rudpi-->Lpi*/bpypi*-based triplet excited state.
Journal ArticleDOI
Radiationless Deactivation of an Intramolecular Charge Transfer Excited State through Hydrogen Bonding: Effect of Molecular Structure and Hard−Soft Anionic Character in the Excited State
Akimitsu Morimoito,Tomoyuki Yatsuhashi,Tetsuya Shimada,László Biczók,Donald A. Tryk,Haruo Inoue +5 more
TL;DR: In this article, the energy-gap dependency for radiationless deactivation from excited states of various molecules having strong intramolecular charge transfer (ICT) character has been investigated by observing fluorescence quenching on addition of alcohols.
Journal ArticleDOI
Effects of molecular structure and hydrogen bonding on the radiationless deactivation of singlet excited fluorenone derivatives
TL;DR: In this article, the electron-donating character of the substituent in the excited fluorenone and the hydrogen-bonding power of alcohol play important roles in determining the rate of dynamic quenching by alcohols.
References
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Journal ArticleDOI
The energy gap law for radiationless transitions in large molecules
Robert Englman,Joshua Jortner +1 more
TL;DR: In this article, a unified treatment of non-radiative decay processes in large molecules which involve either electronic relaxation between two electronic states or unimolecular rearrangeme(s) is presented.
Journal ArticleDOI
Subpicosecond Measurements of Polar Solvation Dynamics: Coumarin 153 Revisited
TL;DR: In this article, the authors used time-resolved emission measurements of the solute coumarin 153 (C153) to probe the time dependence of solvation in 24 common solvents at room temperature.
Journal ArticleDOI
Quantum efficiencies of fluorescence of organic substances: effect of solvent and concentration of the fluorescent solute1
Journal ArticleDOI
Reinterpretation of the anomalous fluorescense of p-n,n-dimethylamino-benzonitrile
TL;DR: In this paper, the existence of two excited species differing in polarity and in the orientation of the N(CH 3 ) 2 group has been attributed to the presence of an excimer.
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Ionization Potentials of Some Molecules
TL;DR: In this article, the ionization potentials of eithtynine molecules have been determined by photoionization measurements and the results are tabulated and compared with those obtained by spectroscopic and electron impact methods.
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