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Issue 10, 2015
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Experimental demonstration of pH-dependent electrostatic catalysis of radical reactions

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Abstract

Time-dependent fluorescence spectroscopy has been used to demonstrate significant pH-dependent electrostatic effects on the kinetics and thermodynamics of hydrogen atom transfer between 1-hydroxy-2,2,6,6-tetramethyl-4-piperidinecarboxylic acid (4-CT-H) and the profluorescent nitroxide {2,2,6,6-tetramethyl-4-[(7-nitro-2,1,3-benzoxadiazol-4-yl)amino]-1-piperidinyl}oxidanyl radical (PFN) in dichloromethane. This pH switching does not occur when 4-CT-H is replaced with a structurally analogous hydroxylamine that lacks an acid-base group, or when the polarity of the solvent is increased. These findings validate our recent theoretical predictions that electrostatic stabilisation of delocalised radicals is of functional significance in low polarity environments.

Graphical abstract: Experimental demonstration of pH-dependent electrostatic catalysis of radical reactions

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Publication details

The article was received on 11 Apr 2015, accepted on 20 Jun 2015 and first published on 23 Jun 2015


Article type: Edge Article
DOI: 10.1039/C5SC01307K
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Citation: Chem. Sci., 2015,6, 5623-5627
  • Open access: Creative Commons BY license
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    Experimental demonstration of pH-dependent electrostatic catalysis of radical reactions

    M. Klinska, L. M. Smith, G. Gryn'ova, M. G. Banwell and M. L. Coote, Chem. Sci., 2015, 6, 5623
    DOI: 10.1039/C5SC01307K

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