Gas-phase energy of the S2←S0 transition and electrostatic properties of the S2 state of carotenoid peridinin via a solvatochromic shift and orientation broadening of the absorption spectrum

2014 ◽  
Vol 13 (10) ◽  
pp. 1444-1455 ◽  
Author(s):  
Vladimir S. Pavlovich
Keyword(s):  
Absorption Spectrum ◽  
Solvent Effect ◽  
Temperature Effect ◽  
Gas Phase ◽  
Aprotic Solvents ◽  
Cavity Model ◽  
Solvatochromic Shift ◽  
Electrostatic Properties ◽  
S2 State

The solvent effect on the position and the shape of the absorption spectrum of peridinin for 12 protic and aprotic solvents as well as the temperature effect for methanol were studied using a solvatochromic theory based on the Onsager sphere cavity model.

Studies on the iodide–triiodide equilibrium

1977 ◽  
Vol 55 (5) ◽  
pp. 792-797 ◽  
Author(s):  
Robert L. Benoit ◽  
Michael F. Wilson ◽  
Sing-Yeung Lam
Keyword(s):  
Free Energy ◽  
Solvent Effect ◽  
Gas Phase ◽  
Formation Enthalpy ◽  
Aprotic Solvents ◽  
Free Energies ◽  
Potentiometric Measurements ◽  
Cast Doubt ◽  
Transfer Parameters ◽  
The Enthalpy Of Formation

The solvent effect on the iodide–triiodide equilibrium has been investigated by means of calorimetric and potentiometric measurements. The aprotic solvents studied were nitromethane, nitrobenzene, sulfolane, acetonitrile, propylene carbonate, acetophenone, dimethylformamide, dimethylsulfoxide, and o-dichlorobenzene. The resulting enthalpy and free energy changes imply that the variations of the enthalpies and free energies of transfer of the iodide and triiodide ions probably are small and that there is an important non-coulombic contribution to these transfer parameters. Values were obtained for the enthalpy of formation of two solid triiodides, which together with values for other triiodides, cast doubt on reported calculated lattice enthalpies of triiodides and formation enthalpy of I3− ion in the gas phase. This latter formation enthalpy is found to be, from our solution data, more negative than −22 kcal mol−1.

Electrostatic effects on ionization equilibria: Solvent dependence

1984 ◽  
Vol 49 (1) ◽  
pp. 179-189 ◽  
Author(s):  
Karel Kalfus ◽  
Zdeněk Friedl ◽  
Otto Exner
Keyword(s):  
Gas Phase ◽  
Carboxylic Acids ◽  
Dissociation Constants ◽  
Aprotic Solvents ◽  
Benzoic Acids ◽  
Cavity Model ◽  
Electrostatic Effects ◽  
Solvent Dependence ◽  
Ionization Equilibria ◽  
Substituted Benzoic Acids

Apparent dissociation constants of 3-substituted bicyclo[2,2,2]-octane-1-carboxylic acids I-III and of several substituted benzoic acids were measured in four pure solvents. The results - together with numerous literature data concerning dissociation in other solvents and in the gas phase - were compared with the prediction of the electrostatic theory. The theory fails to reproduce the essential features of the solvent dependence as it predicts generally too small effects and does not differentiate between protic and aprotic solvents. The mentioned goal cannot be achieved by any more sophisticated cavity model or by any other theory as far as it characterizes the solvent only through its bulk permittivity.

Would the solvent effect be the main cause of band shift in the theoretical absorption spectrum of large lanthanide complexes?

2011 ◽  
Vol 997 (1-3) ◽  
pp. 30-36 ◽  
Author(s):  
Ricardo O. Freire ◽  
Nailton M. Rodrigues ◽  
Gerd B. Rocha ◽  
Iara F. Gimenez ◽  
Nivan B. da Costa Junior
Keyword(s):  
Absorption Spectrum ◽  
Solvent Effect ◽  
Lanthanide Complexes ◽  
Band Shift

Electronic Spectroscopy of Differential Mobility selected Prototropic Isomers of Protonated Para-Aminobenzoic Acid

2021 ◽  
Author(s):  
Neville Coughlan ◽  
Weiqiang Fu ◽  
Mircea Guna ◽  
Bradley Schneider ◽  
Yves Le Blanc ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electronic Spectroscopy ◽  
Aprotic Solvents ◽  
Aminobenzoic Acid ◽  
Differential Mobility

Para-aminobenzoic acid (PABA) was electrosprayed from mixtures of protic and aprotic solvents, leading to formation of two prototropic isomers in the gas phase whose relative populations depended on the composition...

scholarly journals Isoquinoline gas-phase absorption spectrum in the vacuum ultraviolet between 3.7 and 10.7 eV. New valence and Rydberg electronic states

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 5121-5141 ◽  
Author(s):  
Sydney Leach ◽  
Nykola C. Jones ◽  
Søren V. Hoffmann ◽  
Sun Un
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Electronic States ◽  
Synchrotron Source

VUV photons from a synchrotron source were used to record the gas-phase absorption spectrum of isoquinoline over the range 3.5 to 10.7 eV.

Sign in / Sign up

Export Citation Format

Share Document