The ground and first excited singlet state torsional potentials of 2-phenylindole from supersonic jet fluorescence spectra

1997 ◽  
Vol 106 (14) ◽  
pp. 5797-5804 ◽  
Author(s):  
Wayne E. Sinclair ◽  
Haiping Yu ◽  
David Phillips ◽  
J. M. Hollas
Keyword(s):  
Fluorescence Spectra ◽  
Singlet State ◽  
Supersonic Jet ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Torsional Potentials

scholarly journals Bond formation dynamics of dicyanoaurate in the first excited singlet state

2019 ◽  
Vol 205 ◽  
pp. 09021
Author(s):  
So Hyeong Sohn ◽  
Taiha Joo
Keyword(s):  
Wave Packet ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Bond Formation ◽  
Excited Singlet State ◽  
Time Resolved Fluorescence ◽  
Excited Singlet ◽  
Time Resolved ◽  
Formation Dynamics ◽  
Coherent Vibration

Time-resolved fluorescence of [Au(CN)2−]3 in water reveals a coherent vibration of 74 cm-1. A massive non-Condon effect, proved unambiguously by time-resolved fluorescence spectra, demonstrates that the wave packet motion arises from the coherent bond formation.

Electronic absorption and fluorescence spectra and excited singlet-state dipole moments of biologically important pyrimidines

1992 ◽  
Vol 3 (4) ◽  
pp. 277-289 ◽  
Author(s):  
Cyril Párkányi ◽  
Christian Boniface ◽  
Jean-Jacques Aaron ◽  
Mame Diabou Gaye ◽  
Ratna Ghosh ◽  
...  
Keyword(s):  
Electronic Absorption ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Absorption And Fluorescence Spectra ◽  
Excited Singlet

Absorption and Fluorescence Spectra of some 1,3,4-Oxadiazole Derivatives in n-Paraffins at 77 K

1978 ◽  
Vol 33 (6) ◽  
pp. 731-735 ◽  
Author(s):  
P. Bałuk ◽  
A. Kawski
Keyword(s):  
Infrared Spectra ◽  
Ground State ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Vibrational Structure ◽  
Excited Singlet State ◽  
Absorption And Fluorescence Spectra ◽  
Excited Singlet ◽  
Oxadiazole Derivatives

Abstract The quasilinear absorption and fluorescence spectra of 2- (1-naphthyl) -5-phenyl 1,3,4 oxadiazole, 2-(2-naphthyl)-5- phenyl 1,3,4 oxadiazole, 2-(1-naphthyl) -5-(4-biphenylyl) - 1,3,4 oxadiazole and 2-(2-naphthyl)-5-(4-biphenylyl)-1,3,4 oxadiazole have been studied in n-hexane, decane and nonane at 77 K. An analysis of the vibrational structure in the first electronic excited singlet state (S1) and in the ground state (S0) is given. Internal oscillations in the investigated molecules found from the quasilinear spectra are in agreement with those found in the infrared spectra.

Fluorescence of some simple umbelliferone derivatives

1979 ◽  
Vol 44 (2) ◽  
pp. 508-518 ◽  
Author(s):  
Vladimír Mikeš
Keyword(s):  
Excited State ◽  
Hydrogen Bonds ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Excited Singlet State ◽  
Absorption And Fluorescence Spectra ◽  
Excited Singlet ◽  
Nonpolar Medium ◽  
Phenolic Group

The absorption and fluorescence spectra of umbelliferone were studied; it was found that in the excited state the basicity of the α-pyrone part of the molecule increases to such an extent that it exceeds that of the phenolate oxygen of the molecule. This is responsible for the neutral nondissociated form of umbelliferone being only in nonpolar medium which prevents the dissociation of the phenolic group in the excited state. In nonpolar medium, umbelliferone behaves as a substance with closely lying π → π* and n → π* transitions. Hydrogen bonds affect the fluorescence of 7-methoxycoumarin so that the π → π* transition is preserved as the lowest excited singlet state.

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