Intermolecular Interactions in Water-Ethanol Mixtures, Studied by Ultrasound Technique

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Laura-Marinela Ailioaie ◽  
Elena Filip ◽  
Dana-Ortansa Dorohoi
Keyword(s):  
Absorption Band ◽  
Hydrogen Bonds ◽  
Intermolecular Interactions ◽  
Electronic Absorption ◽  
Adiabatic Compressibility ◽  
Primary Alcohols ◽  
Ultrasound Technique ◽  
Oh Groups ◽  
Ternary Solutions ◽  
Electronic Absorption Band

Containing -OH groups with non-participant electrons, water and primary alcohols, form clusters by hydrogen bonds. Mixtures of water and ethanol and their ternary solutions containing small amounts of a spectrally active substance were studied by ultrasound techniques in order to determine the coefficient of adiabatic compressibility considered as being an indicator of the strength of intermolecular interactions in hydroxy liquids. A linear dependence between the adiabatic compressibility of solution and the wavenumber in the maximum of the solute electronic absorption band was evidenced in our experiments.

The 0.9 eV Absorption Band of Polyaniline: A Morphologically Sensitive Electronic Absorption

1989 ◽  
Vol 173 ◽  
Author(s):  
D. Zhang ◽  
J.-H. Hwang ◽  
S. C. Yang
Keyword(s):  
Absorption Band ◽  
Electronic Absorption ◽  
Transition Energy ◽  
Energy Levels ◽  
Electronic Energy ◽  
Emeraldine Base ◽  
Electronic Systems ◽  
Electrically Conductive ◽  
Electronic Energy Levels ◽  
Electronic Absorption Band

The optical absorption spectra of polyaniline in the visible and UV spectral regions have been characterized before. The electrically conductive form has a band gap absorption at 3.8 eV and polaron absorptions at 2.9 and 1.5 eV [1,2] . An additional electronic absorption band at 0.9 eV was found to be also related to the existence of polaron. The assignment of this transition has yet to be made. Epstein and co-workers [31 have found a photo-induced absorption band at 0.9 eV by photo-exciting emeraldine base (insulator) with 2.0 eV light. It is not known yet whether these two 0.9 eV transitions belong to the same set of electronic energy levels of polaron, or they belong to two different electronic systems but are coincidentally have the same transition energy.

Pressure effects on the intervalence-transfer electronic-absorption band of the mixed-valence bis(fulvalene)diiron monocation in various media

1987 ◽  
Vol 109 (24) ◽  
pp. 7340-7345 ◽  
Author(s):  
Usha Sinha ◽  
Michael D. Lowery ◽  
William S. Hammack ◽  
David N. Hendrickson ◽  
Harry G. Drickamer
Keyword(s):  
Absorption Band ◽  
Electronic Absorption ◽  
Mixed Valence ◽  
Pressure Effects ◽  
Electronic Absorption Band
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