A spectroscopic study of the solvent dependent processes of the anils of benzaldehyde and salicylaldehyde

1982 ◽  
Vol 60 (13) ◽  
pp. 1727-1737 ◽  
Author(s):  
Jerry W. Lewis ◽  
Camille Sandorfy
Keyword(s):  
Hydrogen Bond ◽  
Ground State ◽  
Spectral Characteristics ◽  
Infrared And Raman Spectra ◽  
Absorption Data ◽  
Absorption Bands ◽  
Visible Absorption ◽  
Raman Spectral ◽  
Dependent Processes ◽  
Electronic Ground

The ultraviolet–visible, infrared, and Raman spectral characteristics of some anils of benzaldehyde and salicylaldehyde in several solvents have been investigated. The ultraviolet–visible absorption data indicate that in solvents with a proton donating ability less than or equal to trifluoroethanol a single equilibrium exists in solutions of N-(2-hydroxybenzylidene)aniline, whereas in solvents with a proton donating ability equal to or greater than hexafluoroisopropanol more than one equilibrium occurs. The infrared spectra of this compound dissolved in trifluoroethanol do not show new absorption bands in the 1700–1500 cm−1 region; however, new absorption bands in this region do appear when hexafluoroisopropanol is employed as solvent. From these data it is inferred that the first equilibrium involves the breaking of the chelate hydrogen bond and the second equilibrium involves actual protonation of N-(2-hydroxybenzylidene)aniline in the electronic ground state. A comparison of the infrared and Raman spectra of the title compounds is also made and alternate assignments for several observed bands in the 1700–1500 cm−1 region are proposed.

Hole-burning kinetics in biomolecules and polymers

1990 ◽  
Vol 68 (9) ◽  
pp. 1023-1026 ◽  
Author(s):  
Takashi Kushida ◽  
Atusi Kurita ◽  
Yasuo Kanematsu ◽  
Yoshikatsu Touyama
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Low Temperatures ◽  
Laser Light ◽  
Protein A ◽  
Hole Burning ◽  
Absorption Bands ◽  
Broad Distribution ◽  
Doped Polymer ◽  
Electronic Ground

Various characteristics of the change in the absorption spectrum induced by monochromatic laser-light irradiation were compared for a chromophore in a protein, a dye-doped polymer, and a dye-intercalated DNA. It was found that persistent spectral holes are burned in the absorption spectrum of Zn-substituted myoglobin (ZnMb) and of methylene blue intercalated into DNA as easily as of rhodamine 640 in polyvinyl alcohol when the lowest optical absorption bands are illuminated with laser light at low temperatures. In both ZnMb and dye-doped polymer, the hole depth has been found to grow almost logarithmically with burning time. This is explained well by a dispersive burning-kinetics model. A heat-cycle experiment using ZnMb has revealed that the conformational barrier height in the electronic ground state has a broad distribution. We conclude that the hole-burning characteristics are very similar among the systems examined.

ChemInform Abstract: TRIPLET ELECTRONIC GROUND STATE OF TRIMETHYLENEMETHANE

1974 ◽  
Vol 5 (33) ◽  
pp. no-no
Author(s):  
DAVID R. YARKONY ◽  
HENRY F. III SCHAEFER
Keyword(s):  
Ground State ◽  
Electronic Ground State ◽  
Electronic Ground

Consistent characterization of the electronic ground state of Iron (II) Phthalocyanine from valence and core-shell electron spectroscopy

2021 ◽  
Author(s):  
Jonathan Laurent ◽  
John Bozek ◽  
Marc BRIANT ◽  
Pierre Carcabal ◽  
Denis Cubaynes ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ground State ◽  
Electron Spectroscopy ◽  
Organometallic Compound ◽  
Electronic Ground State ◽  
Core Shell ◽  
Shell Electron ◽  
Phthalocyanine Molecule ◽  
Electronic Ground

We studied the Iron (II) Phthalocyanine molecule in the gas-phase. It is a complex transition organometallic compound, for which, the characterization of its electronic ground state is still debated more...

RKR Potentials of 14N16O and 16OH Molecules in the Electronic Ground State

2020 ◽  
Vol 128 (12) ◽  
pp. 1921-1926
Author(s):  
Yu. G. Borkov ◽  
O. N. Sulakshina ◽  
S. V. Kozlov ◽  
T. I. Velichko
Keyword(s):  
Ground State ◽  
Electronic Ground State ◽  
Electronic Ground
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