SOLVENT SHIFTS IN CHARGE-TRANSFER SPECTRA. INFLUENCE OF DONOR STRENGTH

1966 ◽  
Vol 44 (20) ◽  
pp. 2405-2407 ◽  
Author(s):  
H. M. Rosenberg ◽  
E. Eimutis ◽  
D. Hale
Keyword(s):  
Refractive Index ◽  
Dipole Moment ◽  
Excited State ◽  
Charge Transfer ◽  
Charge Transfer Transition ◽  
Transition Energies ◽  
Solvent Shifts ◽  
Excited State Dipole Moment

The charge-transfer transition energies for a series of methylbenzene–tetracyanoethylene complexes in four solvents are reported. The charge-transfer transition energies are found to decrease with increasing solvent refractive index. The magnitude of the decrease appears to be a function of donor strength. It is inferred that the excited state dipole moment decreases with increasing donor strength for these complexes.

Temperaturabhängigkeit der statischen Dielektrizitätskonstante und des optischen Brechungsindexes von Flüssigkeiten

1975 ◽  
Vol 30 (3) ◽  
pp. 287-291 ◽  
Author(s):  
I. Gryczyński ◽  
A. Kawski
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Dipole Moment ◽  
Dipole Moments ◽  
Mixed Solvents ◽  
Temperature Changes ◽  
Temperature Dependences ◽  
Solvent Shifts ◽  
Pure And Mixed Solvents ◽  
Good Agreement

A variation of the temperature changes the static dielectric constant (ε) and the refractive index (n) of solvents and, in conjunction with the measurement of solvent shifts of absorption and fluorescence maxima, allows the investigation of dipole moment changes of solutes in the excited state. For this purpose, investigations of the temperature dependences of ε and n of some pure and mixed solvents of different polarities have been made. It is found that the excited dipole moments of indole, 1,2-dimethylindole, 2,3-dimethylindole and tryptophan obtained from the shifts of the fluorescence maxima in mixed solvents at high temperatures are in good agreement with those obtained in other ways.

scholarly journals Optical anisotropy and charge-transfer transition energies in BiFeO3from 1.0 to 5.5 eV

2011 ◽  
Vol 83 (10) ◽  
Author(s):  
S. G. Choi ◽  
H. T. Yi ◽  
S.-W. Cheong ◽  
J. N. Hilfiker ◽  
R. France ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Optical Anisotropy ◽  
Charge Transfer Transition ◽  
Transition Energies

Electroabsorption spectra of push–pull porphyrins in solution and in solid films

2015 ◽  
Vol 19 (01-03) ◽  
pp. 527-534
Author(s):  
Kamlesh Awasthi ◽  
Hung-Yu Hsu ◽  
Hung-Chu Chiang ◽  
Chi-Lun Mai ◽  
Chen-Yu Yeh ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Charge Transfer ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Ground State ◽  
Benzene Solution ◽  
Solid Films ◽  
The One ◽  
Interfacial Charge

Polarized electroabsorption (E-A) spectra of highly efficient porphyrin sensitizers (YD2 and YD2-oC8) have been measured in benzene solution. Polarized E-A spectra of these push–pull porphyrins embedded in poly(methyl methacrylate) films or sensitized on TiO 2 films are also observed. Based on the analysis of the E-A spectra, the magnitude of the electric dipole moment both in the ground state and in the lowest excited state have been evaluated in solution and in solid films. The electric dipole moment in the excited state of these compounds is very large on TiO 2 films, suggesting the interfacial charge transfer on TiO 2 surface following photoexcitation of porphyrin dyes. The electric dipole moment in the excited state evaluated from the E-A spectra is very different from the one evaluated from the electrophotoluminescence spectra on TiO 2, suggesting that the strong local field of TiO 2 films is applied to the fluorescing dyes attached to TiO 2 films.

Application of time-resolved linear dichroism spectroscopy: Intensity borrowing in charge transfer complex absorption spectra

2003 ◽  
Vol 81 (6) ◽  
pp. 567-574
Author(s):  
Dustin Levy ◽  
Bradley R Arnold
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Chlorinated Solvents ◽  
Linear Dichroism ◽  
Charge Transfer Transition ◽  
Time Resolved ◽  
Transition Energies ◽  
Charge Transfer Transitions ◽  
Donor Acceptor ◽  
Influence Of Solvent

Time-resolved linear dichroism spectroscopy has been used to study the influence of solvent on the charge transfer complex formed between hexamethylbenzene and 1,2,4,5-tetracyanobenzene. It was shown that cyano-substituted solvents induce a 1500 cm–1 increase in the charge transfer transition energies relative to those observed in chlorinated solvents. Furthermore, the angle between the charge transfer absorption transition moments and the photochemically produced radical anion absorption transition moment, after relaxation, has been measured for this complex in several solvents. A simple model was used to correlate the angles measured using time-resolved linear dichroism spectroscopy with the extent of localized excitation mixed into the charge transfer transitions. These measurements reveal that different charge transfer transitions borrow intensity from the localized excitation to different extents. By using different excitation wavelengths, the partitioning of the borrowed intensity among the charge transfer transitions of this complex could be evaluated for the first time.Key words: 1,2,4,5-tetracyanobenzene, hexamethylbenzene, donor–acceptor complex, photoinduced electron transfer, photoselection.

Excited-state dipole moment and polarizability for the 3s Rydberg of ethylene oxide

1983 ◽  
Vol 87 (22) ◽  
pp. 4348-4351 ◽  
Author(s):  
Daniel D. Altenloh ◽  
B. R. Russell ◽  
Linda Rae Ashworth
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Ethylene Oxide ◽  
Excited State Dipole Moment

Excited State Dipole Moment of Pyridine

1971 ◽  
Vol 55 (9) ◽  
pp. 4668-4669 ◽  
Author(s):  
Robin M. Hochstrasser ◽  
J. W. Michaluk
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Excited State Dipole Moment
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