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  Polarity contributions to hyperfine splittings of hydrogen- bonded nitroxides - The microenvironment of spin labels

Marsh, D. (2002). Polarity contributions to hyperfine splittings of hydrogen- bonded nitroxides - The microenvironment of spin labels. Journal of Magnetic Resonance, 157(1), 114-118. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WJX-46K5DRY-D-1&_cdi=6890&_user=38661&_pii=S1090780702925723&_origin=search&_coverDate=07%2F31%2F2002&_sk=998429998&view=c&wchp=dGLbVlW-zSkWA&md5=f7ae33d5b64ef55e90f63c8ca616c71d&ie=/sdarticle.pdf.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-F382-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-EED3-D
Genre: Journal Article

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 Creators:
Marsh, D.1, Author              
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1Department of Spectroscopy and Photochemical Kinetics, MPI for biophysical chemistry, Max Planck Society, ou_578624              

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Free keywords: spin label; hyperfine splittings; solvent effects; polarity; dielectric polarization; hydrogen bonding
 Abstract: A self-consistent treatment of reaction field effects on isotropic N-14 hyperfine coupling constants of nitroxide spin labels in mixtures of polar and apolar solvents is given based on the Onsager approach. It is shown that this works reasonably well for mixtures of water or methanol with dioxane, far better than do conventional approaches using the Clausius-Mossotti relation. Association constants, K-A,K-h, for hydrogen bonding of protic solvents to nitroxides are derived in this way from published EPR data. A value of K-A,K-h approximate to 1.0 M-1 is argued to be reasonable for water in a hydrophobic environment. Data from spin-labelled lipids can then be used to estimate effective water concentrations in biological membranes. (C) 2002 Elsevier Science (USA).

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Language(s): eng - English
 Dates: 2002-07
 Publication Status: Published in print
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 Rev. Method: Peer
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Title: Journal of Magnetic Resonance
Source Genre: Journal
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Pages: - Volume / Issue: 157 (1) Sequence Number: - Start / End Page: 114 - 118 Identifier: -