Effects of solvent on the electronic absorption and fluorescence spectra of quinazolines, and determination of their ground and excited singlet-state dipole moments

1991 ◽  
Vol 47 (3-4) ◽  
pp. 419-430 ◽  
Author(s):  
J.J. Aaron ◽  
A. Tine ◽  
M.D. Gaye ◽  
C. Parkanyi ◽  
C. Boniface ◽  
...  
Keyword(s):  
Electronic Absorption ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Absorption And Fluorescence Spectra ◽  
Excited Singlet

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

Solvent Effects upon the Electronic Absorption and Fluorescence Spectra of Pteridines and Riboflavin and Their Ground and First Excited Singlet State Dipole Moments

Pteridines ◽  
1991 ◽  
Vol 3 (3) ◽  
pp. 153-163 ◽  
Author(s):  
J.-J. Aaron ◽  
M. D. Gaye ◽  
C. Párkányi ◽  
C. Boniface ◽  
T. W. N Bieze ◽  
...  
Keyword(s):  
Electronic Absorption ◽  
Singlet State ◽  
Dipole Moments ◽  
Stokes Shift ◽  
Fluorescence Emission ◽  
Excited Singlet State ◽  
Theoretical Ground ◽  
Excited Singlet ◽  
Solvatochromic Shift ◽  
Wide Range

The electronic absorption. fluorescence excitation, and fluorescence emission spectra of a series of pteridines (lumazine, xanthopterin, isoxanthopterin, biopterin) and riboflavin (vitamin B2) were measured at room temperature (298 K) in a number of solvents covering a wide range of polarities (dioxane, ethyl ether, chloroform, ethyl acetate, 1-butanol. 2-propanol, ethanol, methanol, dimethylformamide, acetonitrile, and dimethyl sulfoxide). The effects of the solvent upon the spectral properties are discussed. Experimental groundstate dipole moments were measured for selected compounds and were used in combination with the spectral data to evaluate their first excited singlet-state dipole moments by means of the solvatochromic shift method (Bakhshiev's and Kawski-Chamma-Viallet's equations based on the variation of the Stokes shift with the solvent dielectric constant-refractive index term). The theoretical ground and excited singlet-state dipole moments for all pteridines and riboflavin were calculated as a vector sum of the π-component (obtained by the PPP method) and the a-component (obtained from a-bond moments). A second set of theoretical values was obtained by using the CNDO/2method. A good agreement was observed between the experimental and the theoretical values. Excited singlet-state dipole moments are higher than the ground state values by 1 to 6 Debye units for all the pteridines under study with the exception of xanthopterin.

Determination of Excited Singlet-State Dipole Moments of Methoxy and Dimethylamino Substituted Benzylidenebenzosuberones Using Solvatochromic Method

2014 ◽  
Vol 48 (5) ◽  
pp. 317-323 ◽  
Author(s):  
Vladimíra Tomečková ◽  
Beáta Veliká ◽  
Sanjay Malhotra ◽  
Miroslava Revická ◽  
Pál Perjési
Keyword(s):  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Solvatochromic Method

Determination of the First Excited Singlet State Dipole Moments of Coumarins by the Solvatochromic Method

1994 ◽  
Vol 27 (4) ◽  
pp. 439-449 ◽  
Author(s):  
Cyril Párkányi ◽  
Maged Shafik Antonious ◽  
Jean-Jacques Aaron ◽  
Michaela Buna ◽  
Alphonse Tine ◽  
...  
Keyword(s):  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Solvatochromic Method
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