Journal
ANALYTICA CHIMICA ACTA
Volume 451, Issue 2, Pages 181-188Publisher
ELSEVIER
DOI: 10.1016/S0003-2670(01)01414-3
Keywords
chemiluminescence; phosphorescence; manganese oxidants
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Chemiluminescence was observed during the manganese(III), (IV) and (VII) oxidations of sodium tetrahydroborate, sodium dithionite, sodium sulfite and hydrazine sulfate in acidic aqueous solution. From the corrected chemiluminescence spectra, the wavelengths of maximum emission were 689 +/- 5 and 734 +/- 5 nm when the reactions were performed in sodium hexametaphosphate and sodium dihydrogenorthophosphate/orthophosphoric acid environments, respectively. The corrected phosphorescence spectrum of manganese(II) sulfate in a solution of sodium hexametaphosphate at 77 K exhibited two peaks with maxima at 688 and 730 nm. The chemical and spectroscopic evidence presented strongly supported the postulation that the emission was an example of solution-phase chemically induced phosphorescence of manganese(II) thereby, confirming earlier predictions that the chemiluminescence from acidic potassium permanganate reactions originated from an excited manganese(II) species. (C) 2002 Elsevier Science B.V. All rights reserved.
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