Synthesis, Spectra and Magnetic Properties of Ion-Pair Charge Transfer Complexes Bis(1-(4-Nitrobenzyl)Pyridinium) Bis(Maleonitriledithiolato) Cobaltate (II or III)

Two new ion-paper charge transfer complexes, [NO₂Py]_{cursive Greek chi} [Co(mnt)₂](NO ₂Py=1-(4-nitrobenzyl)pyridinium;mnt=maleonitriledithiolate;cursive Greek chi=1 or 2 for complex 2 or 1), were synthesized and characterized by element analysis(EA), electronic spray mass spactrum(ES-MS), infrared spectrum (IR) and reflection electrolic spectra. Variable temperature magnetic susceptibilities of the complexes in range of 77-300 K indicate that complex 2 exhibits diamagnetivity complex 2, and the magnetic behavior for complex 1 obeys modification Bleaney-Bowers equation, that is, χ_m = [Ng²μ² _B/3k(T-θ)][1+(1/3)exp(-2J/kT)]^-1. The best fitting gives a good results: g = 2.392,2J/k = 5.9 K, θ = -4.9 K and agreement factor R = 7.20 × 10^-9(R = Σ(χ^obs_i-χ^calcd_i) ²/Σ(χ^obs_i)²).