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Re‐investigation of the conformational interconversion of the 1,2,3,6,7,8‐hexahydropyrene cation radical by EPR, ENDOR and TRIPLE spectroscopy
Author(s) -
Mäkelä Reijo,
Vuolle Mikko
Publication year - 1985
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260230813
Subject(s) - chemistry , electron paramagnetic resonance , spectral line , arrhenius plot , atmospheric temperature range , spectroscopy , arrhenius equation , radical , nuclear magnetic resonance , crystallography , activation energy , organic chemistry , thermodynamics , physics , quantum mechanics , astronomy
The conformational interconversion of the 1,2,3,6,7,8‐hexahydropyrene cation radical has been re‐examined by EPR, ENDOR and TRIPLE spectroscopy, and the Arrhenius plot is presented for a wider temperature range than that used earlier. The EPR spectra were measured from 143 to 369 K and the ENDOR spectra from 143 to 263 K. The thermodynamic constants of the conformational interconversion of the cation radical were determined on the basis of the temperature‐dependent spectra. The high‐resolution spectra clearly show that there are two overlapping spectra at low temperature, and this is confirmed by simulation.