ESR studies on the solvation of perfluoro-n-alkyl t-butyl nitroxides — A new scale for electronegativity of perfluoro-n-alkyl groups

ESR studies on the solvation of perfluoro-n-alkyl t-butyl nitroxides — A new scale for... Pentafluoroethyl t-butyl nitroxides (3) have been generated by the use of electron-transfer reactions of O-benzoyl-N-t-butylhydroxylamine (1) and pentafluoropropanoyl peroxide (2) in F113 (CFCl2CF2Cl) solution. ESR measurement of aN and aF β values for 3 in 11 solvents have been carried out at 17 ± 2 °C. The aN values for 3 in 10 aprotic solvents (but not in i-PrOH) show a linear correlation with the cybotactic solvent parameter ET, i.e. aN = 3.02 × 10−2 ET ± 10.46. Together with the similar correlation analysis for trifluoromethyl t-butyl nitroxide (4) and heptafluoropropyl t-butyl nitroxide (5) reported previously, the physical significance for the slope, slope × ET, the extrapolated intercept on the aN axis, is linked to the sensitivity of the nitroxide toward solvation, the magnitude of the overall solution effect on the aN values, and the intrinsic aN values of 3, 4, 5 in the ideal gaseous state, respectively. The intercepts on the aN axis, 11.34 G, 11.56 G and 11.37 G may serve a new measure of electronegativity for CF3, C2F5 and n-C3F7, respectively. The plots of aN versus noncybotactic solvent constants, such as dipolar moment (μ) and dielectric constant (ɛ), all show random cases. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

ESR studies on the solvation of perfluoro-n-alkyl t-butyl nitroxides — A new scale for electronegativity of perfluoro-n-alkyl groups

Loading next page...
 
/lp/springer_journal/esr-studies-on-the-solvation-of-perfluoro-n-alkyl-t-butyl-nitroxides-a-DBLb02qLPm
Publisher
Springer Journals
Copyright
Copyright © 2000 by VSP
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856700X00552
Publisher site
See Article on Publisher Site

Abstract

Pentafluoroethyl t-butyl nitroxides (3) have been generated by the use of electron-transfer reactions of O-benzoyl-N-t-butylhydroxylamine (1) and pentafluoropropanoyl peroxide (2) in F113 (CFCl2CF2Cl) solution. ESR measurement of aN and aF β values for 3 in 11 solvents have been carried out at 17 ± 2 °C. The aN values for 3 in 10 aprotic solvents (but not in i-PrOH) show a linear correlation with the cybotactic solvent parameter ET, i.e. aN = 3.02 × 10−2 ET ± 10.46. Together with the similar correlation analysis for trifluoromethyl t-butyl nitroxide (4) and heptafluoropropyl t-butyl nitroxide (5) reported previously, the physical significance for the slope, slope × ET, the extrapolated intercept on the aN axis, is linked to the sensitivity of the nitroxide toward solvation, the magnitude of the overall solution effect on the aN values, and the intrinsic aN values of 3, 4, 5 in the ideal gaseous state, respectively. The intercepts on the aN axis, 11.34 G, 11.56 G and 11.37 G may serve a new measure of electronegativity for CF3, C2F5 and n-C3F7, respectively. The plots of aN versus noncybotactic solvent constants, such as dipolar moment (μ) and dielectric constant (ɛ), all show random cases.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 1, 2000

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off