The quest for magnets based upon S = 1/2 bis(maleonitriledithiolato)nickelate(III), {Ni[S2C2(CN)2]2}−, and bis(maleonitriledithiolato)metallate(IV), {M[S2C2(CN)2]2}2− (M = Co, Cu)

The reaction of V0(CO)6 and in situ electrochemically generated Ni[S2C2(CN)2]2, Ni(mnt)2, forms V{Ni[S2C2(CN)2]2}2 [νCN at 2202 cm−1], which exhibits antiferromagnetic coupling (θ ∼ −400 K) and does not magnetically order above 5 K. The reaction of [MII(NCMe)6]2+ (M = V, Cr, Mn, Fe, Co, Ni) and S = 1/2 [M(mnt)2]2− (M′ = Co, Cu) forms MII′[M(mnt)2] that exhibit antiferromagnetic coupling and do not magnetically order above 5 K.

V{Ni[S2C2(CN)2]2}2 an analog the room temperature V[TCNE]x magnet exhibits antiferromagnetic coupling (θ ∼ −400 K) and does not magnetically order.Figure optionsDownload as PowerPoint slide