Magnetic Interaction in the 1:1 Salts of Nitronyl Nitroxide Cations with the Dicyanophthalocyaninatocobalt(III)Anion

Abstract

Two cationic derivatives of α-nitronyl nitroxide (NN), p-PPYNN (p-N-n-propylpyridinium α-nitronyl nitroxide) and p-BPYNN (p-N-n-butylpyridinium α-nitronyl nitroxide), have been crystallized with the [Co(Pc)(CN)2]− (dicyanophthalocyaninatocobalt(III)) counter anion. Obtained two kinds of 1:1 salt crystals have been found to be isomorphous; monoclinic, P21/c, a = 15.585(6), b = 11.015(4), c = 26.111(3) Å, β = 89.95(2)°, V = 4482(3) Å3, Z = 4 for p-PPYNN[Co(Pc)(CN)2] and a = 15.830(3), b = 11.201(4), c = 25.709(3) Å, β = 90.29(1)°, V = 4558.4(17) Å3, Z = 4 for p-BPYNN[Co(Pc)(CN)2]. The magnetic interaction between the NN radicals in these two kinds of crystals has been found not to be the same; weak antiferromagnetic interaction operates in p-PPYNN[Co(Pc)(CN)2], while only paramagnetic behavior is observed for p-BPYNN[Co(Pc)(CN)2].