E.s.r. and mass spectral data prove that the green paramagnetic ion NMPH+ is produced upon irradiation of solutions of NMP+ using solvents like EtOH, MeCN, MeOH, or water; polycrystalline samples of NMP+–TCNQ– prepared under daylight therefore contain appreciable amounts of NMPH+–TCNQ–.
H. J. Keller, D. Nöthe, W. Moroni and Z. G. Soos, J. Chem. Soc., Chem. Commun., 1978, 331 DOI: 10.1039/C39780000331
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