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A CALORIMETRIC DETERMINATION OF THE QUANTUM YIELD FOR THE JONIZATION OF MALACHITE GREEN CYANIDE BY ULTRAVIOLET RADIATION
Author(s) -
Fisher G. J.,
LeBlanc J. C.,
Johns H. E.
Publication year - 1967
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.1751-1097.1967.tb08740.x
Subject(s) - actinometer , molar absorptivity , quantum yield , absorbance , malachite green , chemistry , cyanide , yield (engineering) , absorption (acoustics) , wavelength , analytical chemistry (journal) , ultraviolet , extinction (optical mineralogy) , photochemistry , optics , inorganic chemistry , materials science , physics , mineralogy , chromatography , plasma , quantum mechanics , adsorption , metallurgy , fluorescence
The quantum yield for the conversion of malachite green cyanide (MGL) to the oxidized form MG + has been measured over the wavelength range from 225 to 289 nm using a total absorption aluminium calorimeter to measure the flux of photons. The number of molecules of MGL converted was determined from the increase in absorbance of the solution at 622 nm. MG + was found to have a maximum extinction coefficient of 10.63 × 10 4 at 622 nm. The quantum yield for the conversion of MGL to MG + is constant over the wavelength range with a value of 0.91 ± 0.01. The use of MGL as an actinometer for photochemical studies is described.