Synthesis, crystal structure and magnetism of a three-dimensional Mn(II) coordination polymers with 2,5-dimethylpyrazine-l,4-dioxide as bridging ligand

摘要

A novel three-dimensional Mn(II) coordination polymer, {[Mn(mu_(1.6)-dmpzdo)_3] centre dot (ClO_4)_2}_n, has been synthesized with 2,5-dimethylpyrazine-l,4-dioxide (dmpzdo) as a bridging ligand and its crystal structure determined by X-ray crystallography. The complex crystallizes in a trigonal system with a space group R-3 and a= 11.6672(14), b = 11.6672(14), c= 16.652(4) A. In the complex each Mn(II) is coordinated by six mu_(1.6)-dmpzdo bridging ligands and each mu_(1.6)-dmpzdo bridging ligand coordinates two Mn(II) ions, forming a three-dimensional structure. The variable temperature (4-300 K) magnetic susceptibility data gave the magnetic coupling constant 2J = -0.30cm~(-1).