Premium
THE CORRELATION BETWEEN THE ABSORPTION AND THE FLUORESCENCE ENERGY SPECTRA, AND THE QUANTUM YIELD OF CHLOROPHYLL a IN DIFFERENT SOLVENTS †
Author(s) -
SINGHAL G. S.,
HEVESI J.
Publication year - 1971
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.1751-1097.1971.tb06189.x
Subject(s) - quantum yield , chemistry , dimethylformamide , excited state , solvent , fluorescence , absorption spectroscopy , yield (engineering) , absorption (acoustics) , analytical chemistry (journal) , spectral line , photochemistry , materials science , atomic physics , thermodynamics , organic chemistry , physics , quantum mechanics , composite material , astronomy
— The applicability of Stepanov's relation to solutions of chlorophyll a in 17 solvents was determined. The value of T* (the local temperature of the excited molecules calculated by the relation) was higher than T (the ambient temperature) in 7 solvents and lower in one. The relative quantum yield determined by comparing the fluorescence spectrum with the thermal emission spectrum was fairly constant (˜ 1.0) up to 690 nm in dioxane, methylene chloride and dimethylformamide. In other solvents its value at 690 nm varied between 0.2 and 067. It is suggested that existence of a solute‐solute or solute‐solvent interaction in some solvents could possibly cause such a drop in the quantum yield.