Synthsis, structures and magnetic properties of three new coordination polymers constructed by mixed-linker strategy

摘要: Abstract By the reaction of a rigid π-conjugated linker H4L (5,5′-(1,3,6,8-tetraoxobenzo [lmn] [3] , [8] phenanthroline-2–7- diyl) bis-1,3-benzenedicarboxylic acid), nickel nitrate and N-donor auxiliary linkers under solvothermal conditions, three new Ni-based coordination polymers (CPs), namely {[Ni(L)0.5(1,4-bib)(H2O)2]·2·5H2O·DMA}n (1), {[Ni(H2L)(4,4′-bibp)(H2O)2]}n (2) {[Ni(L)0.5(4,4′-bimb)(H2O)2]·3·5H2O·2DMA}n (3) {1,4-bib = 1,4-bis(1-imidazoly)benzene, 4,4′-bibp = 4,4′-bis(imidazolyl)biphenyl, 4,4′-bimb = 4,4′-bis(imidazol-1-ylmethyl) biphenyl} have been synthesized characterized by EA, TG, IR, PXRD magnetic properties. The structural analysis indicates both 1 2 are 2D layer structures, which further extended to 3D supramolecular structures H-bonding intermolecular π…π interactions. While 3 exhibits complicated structure with topology symbol {64.82}. difference in CPs 1–3 is mainly attributed different used. Meanwhile, properties show that descent χMT values zero-field splitting (ZFS) effects Ni2+ ions. In addition, on account large separations within these frameworks, interactions between adjacent ions can be neglected.