A dinuclear nickel(II) complex bridged by tricyanomethanide: structure and magnetic properties

Complexation of NiII ion with triethylenetetramine (teta) and potassium tricyanomethanide KC(CN)3 yielded a new binuclear complex, [(teta)Ni(C(CN)3)2Ni(teta)](ClO4)2 (1), where two nickel(II) centres are held together by two tricyanomethanide bridges. The dinuclear units are aggregated into ladders; four of them being identified inside the unit cell. The effective magnetic moment on the cooling exhibits a slight gradual increase until 25 K; below this limit a strong, abrupt ferromagnetic interaction culminating at 16 K appears.