Basicity of coumarin derivatives in the ground and excited states

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · J. Gen. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6950690

Ponomarev, O A; Mitina, V G; Vasina, E R; Yarmolenko, S N

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.

• Research Organization: Khar'kov State University
• OSTI ID: 6950690
• Journal Information: J. Gen. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Gen. Chem. USSR (Engl. Transl.); (United States) Vol. 55:1, PT 2; ISSN JGCHA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ABSORPTION SPECTRA
CARBONYLS
COUMARIN
DIAGRAMS
ENERGY LEVELS
ESTERS
EXCITED STATES
GROUND STATES
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LACTONES
LASER SPECTROSCOPY
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PH VALUE
PYRANS
SPECTRA
SPECTROSCOPY
SULFURIC ACID