133480-35-0Relevant academic research and scientific papers
Substituent effects on benzyl radical hyperfine coupling (hfc) constants. Part 3. Comparison of the α-hfc for substituted benzyl radicals with the β-hfc for substituted cumyl radicals
Arnold, Donald R.,Nicholas, A. Martin de P.,Snow, Miles S.
, p. 1150 - 1156 (2007/10/02)
The electron spin resonance (esr) spectra of eighteen para-substituted cumyl radicals were analyzed.The relationship between the β-hyperfine coupling (β-hfc) constants of these cumyl radicals and the corresponding α-hfc constants of benzyl radicals was studied.Although there is a general trend for the α- and β-hfc values to vary in a similar manner, specific deviations from a linear correlation between these parameters were observed.These deviations were rationalized by considering charge effects on spin delocalization.The correlation coefficient for the linear regression analysis of these α- and β-hfc values was found to significantly improve when parameters reflecting charge effects on spin delocalization were included in an extended Hammett treatment of the spectral data.
