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The effect of nitro substitution on the photochemistry of benzyl benozhydroxamate: Photoinduced release of benzohydroxamic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
27190 44008 2012 10 PDF Available
Title
The effect of nitro substitution on the photochemistry of benzyl benozhydroxamate: Photoinduced release of benzohydroxamic acid
Abstract

The redox congener of the important signaling agent nitric oxide (NO), nitroxyl or nitrosyl hydride (HNO) has also been demonstrated to induce distinct physiological effects. The aim of this study was to determine if benzohydroxamic acid, which was selected as a stable model compound of HNO donors, could be released by the o-nitrobenzyl photolabile protecting group (PPG) in a wavelength-dependent manner. It was expected that selective irradiation of the o-nitrobenzyl chromophore would favor the release of benzohydroxamic acid over undesired products associated with N–O bond cleavage. Quantum yields for the release of benzohydroxamic acid protected by the o-nitrobenzyl PPG increased at longer wavelengths, with a concomitant decrease in the yield of minor products. Through the use of triplet photosensitizers, triplet quenchers, computational methods, and the position of the nitro substituent, insights into the nature of the mechanism were suggested.

► The o-nitrobenzyl photolabile protecting group released benzohydroxamic acid. ► Longer wavelengths favored release over N–O bond cleavage. ► Shorter wavelengths favor N–O bond cleavage products via triplet. ► Position of nitro substituent has dramatic effect on observed photochemistry. ► Results indicated HNO donors could be released by photolabile groups.

Keywords
Hydroxamate; Nitroxyl; Nitrosyl hydride; Photolabile protecting group; Nitrobenzyl; Wavelength dependent
First Page Preview
The effect of nitro substitution on the photochemistry of benzyl benozhydroxamate: Photoinduced release of benzohydroxamic acid
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 227, Issue 1, 1 January 2012, Pages 1–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering