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Reaction of 2,2-Diphenyl-1-picrylhydrazyl with HO•, O2•–, HO– ,and HOO– Radicals and Anions
Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
Institute of Organic Chemistry “C. D. Nenitzescu” of the Romanian Academy, Splaiul Independentei 202B, Bucharest 15-256, Romania
National Agency for Medicinal Drugs, Aviator Sanatescu Street 48, Bucharest, Romania
University of Bucharest, Department of Physical Chemistry, Bulevardul Elisabeta 4-12, Bucharest, Romania
Texas A&M University, 5007 Avenue U, Galveston, TX 77551, USA
* Authors to whom correspondence should be addressed.
Received: 24 March 2006; Accepted: 15 May 2006 / Published: 15 May 2006
Abstract: Using electronic absorption spectra and thin layer chromatography, the reactionof 2,2-diphenyl-1-picrylhydrazyl (DPPH) with O2•–, HO•, HO–, and HOO– anions and freeradicals revealed the formation of the para-nitro- and para-hydroxy-derivatives of 2,2-diphenyl-1-picrylhydrazine (DPPH-H) and of DPPH fragmentation products(diphenylamine, tetraphenylhydrazine). The reaction of DPPH with the O2•– anion-radical(from KO2 in benzene solution at room temperature in the presence of 18-crown-6 ether) ispseudo-first-order during the first 25 minutes.
Keywords: Diphenylpicrylhydrazyl; Reactions with potassium superoxide; hydrogen peroxide; hydroxy free radical.
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Hristeac, E.N.; Caproiu, M.T.; Pencu, G.; Hillebrand, M.; Constantinescu, T.; Balaban, A.T. Reaction of 2,2-Diphenyl-1-picrylhydrazyl with HO•, O2•–, HO– ,and HOO– Radicals and Anions. Int. J. Mol. Sci. 2006, 7, 130-143.
Hristeac EN, Caproiu MT, Pencu G, Hillebrand M, Constantinescu T, Balaban AT. Reaction of 2,2-Diphenyl-1-picrylhydrazyl with HO•, O2•–, HO– ,and HOO– Radicals and Anions. International Journal of Molecular Sciences. 2006; 7(5):130-143.
Hristeac, Elena N.; Caproiu, Miron T.; Pencu, Gabriela; Hillebrand, Mihaela; Constantinescu, Titus; Balaban, Alexandru T. 2006. "Reaction of 2,2-Diphenyl-1-picrylhydrazyl with HO•, O2•–, HO– ,and HOO– Radicals and Anions." Int. J. Mol. Sci. 7, no. 5: 130-143.