Effects of substituent and external pressure on spin trapping rates of carbon dioxide anion, sulfur trioxide anion, hydroxyl, and ethyl radicals with various PBN- and DMPO-type spin traps

Yoshimi Sueishi, Keitaro Miyazono, Kazuki Kozai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Using a competitive trapping method employing two different traps, the trapping rates of anionic radicals (CO2-· and SO3-·), hydroxyl, and ethyl were quantified for various PBN- and DMPO-type traps. We have examined the characteristic effects of substituent and external pressure on the spin trapping of anionic radicals and compared with those of neutral radicals such as ethyl and hydroxyl radicals. In DMPO-type traps, the effects of substituent on trapping rates of two anionic radicals were small compared with that of C2H5·. In PBN-type traps, the large effects of substituent on trapping rates of CO2-· and C2H5· were observed. Further, the activation volumes determined from the pressure dependence experiments for competitive reactions show a difference in pressure behavior between the two trapping reactions, and enable us to speculate on the reaction mechanism of substituted PBN and DMPO traps for anionic radicals.

Original languageEnglish
Pages (from-to)927-938
Number of pages12
JournalZeitschrift fur Physikalische Chemie
Volume228
Issue number9
DOIs
Publication statusPublished - 2014

Fingerprint

hydroxyl radicals
Carbon Dioxide
Hydroxyl Radical
Anions
carbon dioxide
sulfur
trapping
traps
anions
Chemical activation
pressure dependence
sulfur trioxide
Experiments
activation

Keywords

  • High-Pressure ESR
  • Spin Trap
  • Substituent Effect
  • Trapping Rate

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

@article{4cd72aff15634b30a6ec13dda7fecc28,
title = "Effects of substituent and external pressure on spin trapping rates of carbon dioxide anion, sulfur trioxide anion, hydroxyl, and ethyl radicals with various PBN- and DMPO-type spin traps",
abstract = "Using a competitive trapping method employing two different traps, the trapping rates of anionic radicals (CO2-· and SO3-·), hydroxyl, and ethyl were quantified for various PBN- and DMPO-type traps. We have examined the characteristic effects of substituent and external pressure on the spin trapping of anionic radicals and compared with those of neutral radicals such as ethyl and hydroxyl radicals. In DMPO-type traps, the effects of substituent on trapping rates of two anionic radicals were small compared with that of C2H5·. In PBN-type traps, the large effects of substituent on trapping rates of CO2-· and C2H5· were observed. Further, the activation volumes determined from the pressure dependence experiments for competitive reactions show a difference in pressure behavior between the two trapping reactions, and enable us to speculate on the reaction mechanism of substituted PBN and DMPO traps for anionic radicals.",
keywords = "High-Pressure ESR, Spin Trap, Substituent Effect, Trapping Rate",
author = "Yoshimi Sueishi and Keitaro Miyazono and Kazuki Kozai",
year = "2014",
doi = "10.1515/zpch-2014-0538",
language = "English",
volume = "228",
pages = "927--938",
journal = "Zeitschrift fur Physikalische Chemie",
issn = "0942-9352",
publisher = "Oldenbourg Wissenschaftsverlag GmbH",
number = "9",

}

TY - JOUR

T1 - Effects of substituent and external pressure on spin trapping rates of carbon dioxide anion, sulfur trioxide anion, hydroxyl, and ethyl radicals with various PBN- and DMPO-type spin traps

AU - Sueishi, Yoshimi

AU - Miyazono, Keitaro

AU - Kozai, Kazuki

PY - 2014

Y1 - 2014

N2 - Using a competitive trapping method employing two different traps, the trapping rates of anionic radicals (CO2-· and SO3-·), hydroxyl, and ethyl were quantified for various PBN- and DMPO-type traps. We have examined the characteristic effects of substituent and external pressure on the spin trapping of anionic radicals and compared with those of neutral radicals such as ethyl and hydroxyl radicals. In DMPO-type traps, the effects of substituent on trapping rates of two anionic radicals were small compared with that of C2H5·. In PBN-type traps, the large effects of substituent on trapping rates of CO2-· and C2H5· were observed. Further, the activation volumes determined from the pressure dependence experiments for competitive reactions show a difference in pressure behavior between the two trapping reactions, and enable us to speculate on the reaction mechanism of substituted PBN and DMPO traps for anionic radicals.

AB - Using a competitive trapping method employing two different traps, the trapping rates of anionic radicals (CO2-· and SO3-·), hydroxyl, and ethyl were quantified for various PBN- and DMPO-type traps. We have examined the characteristic effects of substituent and external pressure on the spin trapping of anionic radicals and compared with those of neutral radicals such as ethyl and hydroxyl radicals. In DMPO-type traps, the effects of substituent on trapping rates of two anionic radicals were small compared with that of C2H5·. In PBN-type traps, the large effects of substituent on trapping rates of CO2-· and C2H5· were observed. Further, the activation volumes determined from the pressure dependence experiments for competitive reactions show a difference in pressure behavior between the two trapping reactions, and enable us to speculate on the reaction mechanism of substituted PBN and DMPO traps for anionic radicals.

KW - High-Pressure ESR

KW - Spin Trap

KW - Substituent Effect

KW - Trapping Rate

UR - http://www.scopus.com/inward/record.url?scp=84914703399&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84914703399&partnerID=8YFLogxK

U2 - 10.1515/zpch-2014-0538

DO - 10.1515/zpch-2014-0538

M3 - Article

AN - SCOPUS:84914703399

VL - 228

SP - 927

EP - 938

JO - Zeitschrift fur Physikalische Chemie

JF - Zeitschrift fur Physikalische Chemie

SN - 0942-9352

IS - 9

ER -