Electron spin resonance spectra of the triple ions [Na2-pyrazine]+ and [Na2-tetramethylpyrazine]+

Abstract

Reduction of pyrazine (P) and tetramethylpyrazine (TMP) by sodium in the presence of sodium tetraphenylboride produces Na2P+ and Na2TMP+, respectively. The electron spin resonance spectra of these species are presented and compared with those of the corresponding ion pairs. From line-broadening effects within the sodium hyperfine multiplets of the triple ion spectra, it is deduced that the sodium ions occupy positions close to the N–N axes of the ring systems.