Solvent effects on electronic absorption spectra of nitrochlorobenzenes, nitrophenols and nitroanilines—II. Studies in polar solvents

1988 ◽  
Vol 44 (2) ◽  
pp. 213-220 ◽  
Author(s):  
L.S. Prabhumirashi ◽  
S.S. Kunte
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Solvent Effects ◽  
Electronic Absorption Spectra ◽  
Polar Solvents

THE ELECTRONIC ABSORPTION SPECTRA OF DIXANTHOGENS

1961 ◽  
Vol 39 (12) ◽  
pp. 2590-2592 ◽  
Author(s):  
M. L. Shankaranarayana ◽  
C. C. Patel
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
High Intensity ◽  
Electronic Absorption Spectra ◽  
Blue Shift ◽  
Polar Solvents ◽  
Low Intensity

The electronic absorption spectra of diethyl, diisopropyl, di-n-butyl, and diisoamyl dixanthogens have been studied in polar and non-polar solvents. The compounds exhibit a low-intensity band around 365 mµ and two high-intensity bands around 285 and 242 mµ. The 365 mµ band is assigned, as a result of the solvent studies, to n → π* transition and the 285 mµ band to π → π* transition. The band around 242 mµ may be due to the n → σ* transition, since in polar solvents it shows mainly a blue shift.

Molecular interactions in the spectra of diaza-aromatics

1974 ◽  
Vol 27 (8) ◽  
pp. 1613 ◽  
Author(s):  
JR Honner ◽  
PR Nott ◽  
BK Selinger
Keyword(s):  
Hydrogen Bonding ◽  
Absorption Spectra ◽  
Molecular Interactions ◽  
Electronic Absorption ◽  
Low Temperatures ◽  
Electronic Absorption Spectra ◽  
Polar Solvents ◽  
Hydrogen Bonding Interactions ◽  
Low Concentrations

A reported variation of the electronic absorption spectra of diaza-aromatics in non-polar solvents with temperature appears to be explicable in terms of three effects. Hydrogen bonding interactions occur in all but exhaustively dried non-polar solvents. Microcrystals form readily at low temperatures at even quite low concentrations (c. 10-5M). The solutions are sensitive to exposure to light. The diaza-aromatics undergo photochemical change forming, in some cases, photoadducts with the solvent.

Excited State Polarizability of Some Polycyclic Polyenes

2017 ◽  
Vol 68 (2) ◽  
pp. 307-310 ◽  
Author(s):  
Ana Maria Ciubara ◽  
Andreea Celia Benchea ◽  
Carmen Beatrice Zelinschi ◽  
Dana Ortansa Dorohoi
Keyword(s):  
Excited State ◽  
Absorption Spectra ◽  
Excited States ◽  
Electronic Absorption ◽  
Ground State ◽  
Electronic Absorption Spectra ◽  
Photon Absorption ◽  
Absorption Process ◽  
Polar Solvents ◽  
Molecular Parameters

The electronic absorption spectra of five polycyclic polyenes were recorded in non-polar solvents in order to determine their polarizability in excited states from the strength of the dispersive interactions in their diluted solutions. The bathochromic shifts of p-p* vibronic bands prove the increase of the molecular polarizabilty in the photon absorption process. Some molecular parameters of the analyzed polyenes in their ground state were computed by using the programs from Spartan�14.

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