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The effect of solvents on the electronic absorption spectra of mesoionic 1,8,4 thiadiazolium‐2‐thiolate derivatives
Author(s) -
Kiwan A. M.,
Marafie H. M.
Publication year - 1976
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570130625
Subject(s) - chemistry , mesoionic , chloroform , acetone , cyclohexane , polarity (international relations) , solvent , absorption spectroscopy , absorption (acoustics) , molecular electronic transition , aqueous solution , solvent effects , atomic electron transition , absorption band , spectral line , photochemistry , organic chemistry , molecule , biochemistry , physics , quantum mechanics , astronomy , acoustics , optics , cell
The electronic absorption spectra of 4,5‐diphenyl‐, 4‐pheriyl‐5‐(4‐fluorophenyl)‐, 4‐phenyl‐5‐(4‐chlorophenyI)‐, and 4‐phenyl‐.5‐methyl‐1,3,4‐lhiadiazolium‐2‐thiolates have been measured in twenty‐one pure solvents, aqueous ethanol and acetone solutions and cyclohexane‐chloroform mixtures. They were found to exhibit three characteristic absorption bands; the first in the range 330‐440 nm, the second at 260‐280 run and the third near 200 ran. The first band was assigned to n → π* transition whereas the other two bands were assigned to π →π* transition. The n → π* transition band was found to be very sensitive, and the polarity of solvents, and some correlations between well‐known solvent polarity parameters and the transition energies of these compounds have been presented.