Structures and properties of two novel one-dimensional complexes bridged by 4,4′-methylenebis(3,5-dimethylpyrazole)

Two novel one-dimensional Co(II) and Zn(II) complexes {[Co(H2mbdpz)2](ClO4)2}n (1) and {[Zn(H2mbdpz)(NCS)2](DMF)2}n (2) (H2mbdpz=4,4′-methylenebis(3,5-dimethylpyrazole)) have been synthesized and structurally characterized. In complex 1, the strict alternation of the double-bridging [Co(H2mbdpz)2]2+ ring units formed an infinite chain with the neighboring ring planes being close to 90°; the replacement of H2mbdpz with thiocyanate ions leading to a single-bridging zigzag chain, was found in complex 2. The magnetic susceptibility indicated that complex 1 was almost no magnetic interactions between the cobalt(II) ions and the corresponding J value was −0.08 cm−1 and g=2.27.