Magnetism in organic radical ion salts and complexes based on nitronyl nitroxide

Magnetic properties of purely organic radical ion salts and complexes based on nitronyl nitroxide (NN) derivatives were investigated. The salts and co mplexes are composed of N-alkylareniumyl NN as the radical cations and carb oxylatoaryl, sulfonatoaryl and imidazolidyl NN as the radical anions. Tetra cyanoquinodimethanide (TCNQ)(-) salts and complexes were also prepared. The results obtained for several complexes of a multifunctional molecule, 2-im idazoly NN (2-IMNN), are presented in detail, because 2-IMNN can be convert ed to various with p-carboxylatophenyl NN states by electron and proton tra nsfers. The proton-transfer complex of 2-imidazoliniumyl NN (2-IMNN)(+*) wi th (p-CAPNN)(-*) shows magnetic behavior relevant to coexistence of intermo lecular ferro- and antiferro-magnetic interactions. Several quinoliniumyl N N(QNNN)(+*)(p-CAPNN)(-*) complexes exhibit magnetic behavior similar to tha t observed in (2-IMNN)(+*)(p-CAPNN)(-*).