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KYNURENIC ACID — I. SPECTROSCOPIC PROPERTIES
Author(s) -
Pileni M. P.,
Giraud M.,
Santus R.
Publication year - 1979
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1979.tb07143.x
Subject(s) - kynurenic acid , intersystem crossing , quantum yield , chemistry , photochemistry , excited state , spectroscopy , fluorescence , molar absorptivity , flash photolysis , singlet state , ground state , atomic physics , physics , biochemistry , nmda receptor , receptor , quantum mechanics , reaction rate constant , optics , kinetics
— The presence of different ground state species in ionic and/or keto s enol equilibrium has been demonstrated by studying NMR, IR and UV spectroscopic properties of kynurenic acid and related quinoline derivatives. The optical and emission properties of kynurenic acid and related compounds are thus very sensitive to pH conditions. Fluorescence and intersystem crossing (ISC) quantum yields have been measured in various solvents. The first excited singlet state is probably very short‐lived in neutral aqueous solution. The triplet state is long‐lived (10 μs) as shown by 353 nm laser flash spectroscopy. A high ISC quantum yield and a large molar extinction coefficient make it easy to detect the T 1 → T n transient (Δ max ≃ 570 nm).