Two new salts containing bis(maleonitriledithiolate)nickel(III)/copper(II) anion and substituted N,N′-dibenzylpiperidinium: Syntheses, crystal structures and magnetic properties

摘要

The preparation, crystal structures and magnetic properties of two novel salts, [DiBzPid][Ni(mnt) _2](1) and [DiBzPid] _2[Cu(mnt) _2](2), where [DiBzPid] ~+ = N,N′-dibenzylpiperidinium and mnt ~(2-) = maleonitriledithiolate, are investigated. The Ni(III) ions of 1 form a 1D zigzag alternating chain in a [Ni(mnt) _2] ~- column through intermolecular π?π stacking interaction, short C?S and C?N interactions between the adjacent anions, while the cations(C) and anions(A) of 2 stack into a 1D alternating ?CCACCACC? column via C-H?N, C-H?π hydrogen bonds and π?π stacking interactions. Magnetic susceptibility measurements in the temperature range 2-300 K show that 1 exhibits a spin-gap transition around 150 K with Δ/k _b = 429.94 K, while 2 shows a very weakly ferromagnetic coupling behavior with θ = 1.18 × 10 ~(-2) K.