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Title: Basicity of coumarin derivatives in the ground and excited states

Abstract

The acid-base properties of coumarin luminophores are widely used for widening the optical spectrum generated by lasers. The aim of this work was a quantitative study of the proton-acceptor capacity of a series of substituted coumarins at the H-complex formation stage and during protonation, and also to evaluate the basicity of these compounds in the first excited singlet state. The compounds chosen were the 4- and 7-substituted coumarins, most widely used in laser technology. In the ground state the sensitivity of the carbonyl group to the effect of a substituent was twice as great in position 4 as in position 7; for the excited state the effect was reversed.

Authors:
; ; ;
Publication Date:
Research Org.:
Khar'kov State University
OSTI Identifier:
6950690
Resource Type:
Journal Article
Journal Name:
J. Gen. Chem. USSR (Engl. Transl.); (United States)
Additional Journal Information:
Journal Volume: 55:1, PT 2
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; COUMARIN; EXCITED STATES; GROUND STATES; LASER SPECTROSCOPY; PH VALUE; ABSORPTION SPECTRA; CARBONYLS; DIAGRAMS; SULFURIC ACID; ENERGY LEVELS; ESTERS; HETEROCYCLIC COMPOUNDS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; LACTONES; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; PYRANS; SPECTRA; SPECTROSCOPY; 420300* - Engineering- Lasers- (-1989)

Citation Formats

Ponomarev, O A, Mitina, V G, Vasina, E R, and Yarmolenko, S N. Basicity of coumarin derivatives in the ground and excited states. United States: N. p., 1985. Web.
Ponomarev, O A, Mitina, V G, Vasina, E R, & Yarmolenko, S N. Basicity of coumarin derivatives in the ground and excited states. United States.
Ponomarev, O A, Mitina, V G, Vasina, E R, and Yarmolenko, S N. 1985. "Basicity of coumarin derivatives in the ground and excited states". United States.
@article{osti_6950690,
title = {Basicity of coumarin derivatives in the ground and excited states},
author = {Ponomarev, O A and Mitina, V G and Vasina, E R and Yarmolenko, S N},
abstractNote = {The acid-base properties of coumarin luminophores are widely used for widening the optical spectrum generated by lasers. The aim of this work was a quantitative study of the proton-acceptor capacity of a series of substituted coumarins at the H-complex formation stage and during protonation, and also to evaluate the basicity of these compounds in the first excited singlet state. The compounds chosen were the 4- and 7-substituted coumarins, most widely used in laser technology. In the ground state the sensitivity of the carbonyl group to the effect of a substituent was twice as great in position 4 as in position 7; for the excited state the effect was reversed.},
doi = {},
url = {https://www.osti.gov/biblio/6950690}, journal = {J. Gen. Chem. USSR (Engl. Transl.); (United States)},
number = ,
volume = 55:1, PT 2,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1985},
month = {Mon Jul 01 00:00:00 EDT 1985}
}