Basicity of coumarin derivatives in the ground and excited states

Journal Article · Mon Jul 01 00:00:00 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), Vol. 55:1, PT 2
• Country of Publication: United States
• Language: English

Related Subjects

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)