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EFFECT OF IRON(III) ON CHEMILUMINESCENCE FROM THE NEUTRALIZATION REACTION OF NITRIC ACID and POTASSIUM HYDROXIDE
Author(s) -
Fujiwara Terufumi,
Sakai Hiroyuki,
Kumamaru Takahiro
Publication year - 1995
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.1751-1097.1995.tb02365.x
Subject(s) - chemistry , nitric acid , neutralization , chemiluminescence , inorganic chemistry , hydroxide , reagent , catalysis , oxygen , potassium hydroxide , potassium , photochemistry , organic chemistry , antibody , immunology , biology
— Low levels (around 90 μM) of iron(III) caused an increase in chemiluminescence (CL) from the neutralization reaction involving nitric acid and potassium hydroxide without use of any luminescent reagent. When oxygen was excluded from the reaction, a significant decrease in the CL emission was observed. This suggests that molecular oxygen present in the solutions may play an important role in the process of the iron‐catalyzed CL induced by the neutralization reaction, which liberates a sufficient energy. Other experimental parameters like the influence of several other metal ions, counteranions and acid media were also examined. The results showed that the observed CL enhancement by iron(III) proved to become most remarkable under sporadical conditions alone, and the presence of small amounts (less than 0.20 mM) of sulfate ion increase the catalytic activity of iron(III). A possible mechanism involving transient formation of iron–radical complexes upon neutralization and subsequent reaction of the complexes with molecular oxygen is considered for the present CL reaction.