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Experimental Section
1-Fe and 1-Mn were prepared by reported procedures.[21–23] Peroxy-
nitrite was prepared from the reaction of sodium nitrite with acidified
hydrogen peroxide according to reported procedures, which included
a treatment for destroying excess H2O2.[30] Nitrite was quantified by
the Griese reagent.[16] Time-resolved visible spectra were recorded on
an Applied Photophysics PiStar-180 spectrometer in the photodiode-
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multiplier mode on the PiStar-180 spectrometer, using a single mixing
mode.One syringe contained peroxynitrite (770 mm) in NaOH
(50 mm), and the other contained phosphate buffer with or without
the catalysts.Equal volumes were injected into a stopped-flow cell,
and the pH value of the reaction mixture was measured at the outlet.
The configuration of the instrument permitted continuous flow of
water from a thermostated bath over the flow path and firing syringes
containing the reagents.Peroxynitrite decay was monitored at
302 nm.First-order decay rates
techniques with software provided by the instrument manufacturer.
( kobs) were fitted by standard
Received: April 9, 2006
Revised: June 20, 2006
Published online: September 8, 2006
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Keywords: corroles· homogeneouscatalysis· iron ·
manganese · peroxynitrite
.
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