PHOTOLYSIS OF AQUEOUS SOLUTIONS OF POTASSIUM CIS-DIAQUOBIS (OXALATO) CHROMATE (III) |
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| Authors: | M W ROPHAEL M A MALATI |
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| Institution: | The National Research Centre, Cairo, Egypt;Medway and Maidstone College of Technology, Chatham, Kent, England |
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| Abstract: | Abstract— The photolysis of aqueous solutions of cis -Cr(C2O4)2(H2O)2]- at 254 nm and pH 4 produced CO2 and H2 in nearly equal yields. The quantum yield of hydrogen, φ2, 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, φgas, decreased in the presence of added oxalate or chromium (II) ions and when the light intensity was lowered. The gas yield in D2O was appreciably higher than in H2O. The variation of φgas 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. |
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