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PHOTOLYSIS OF AQUEOUS SOLUTIONS OF POTASSIUM CIS ‐DIAQUOBIS (OXALATO) CHROMATE (III)
Author(s) -
ROPHAEL M. W.,
MALATI M. A.
Publication year - 1973
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.1751-1097.1973.tb06371.x
Subject(s) - chemistry , quantum yield , aqueous solution , yield (engineering) , oxalate , photodissociation , potassium chromate , chromate conversion coating , inorganic chemistry , carbon dioxide , chromium , potassium , ion , photochemistry , organic chemistry , materials science , physics , quantum mechanics , metallurgy , fluorescence
— The photolysis of aqueous solutions of cis ‐[Cr(C 2 O 4 ) 2 (H 2 O) 2 ]‐ at 254 nm and pH 4 produced CO 2 and H 2 in nearly equal yields. The quantum yield of hydrogen, φ 2 , increased by 9% and the yield of carbon dioxide, φ, by 65% as the pH was lowered from 4 to I. The total gas yield, φ gas , decreased in the presence of added oxalate or chromium (II) ions and when the light intensity was lowered. The gas yield in D 2 O was appreciably higher than in H 2 O. The variation of φ gas with pH (D) and with added oxalate ion was roughly parallel in the two liquid media. The gas yield increased in the series: A tentative mechanism is suggested to explain the results.