Syntheses, crystal structures, and magnetic and fluorescence properties of three complexes of mixed flexible N,N′-bis(3-pyridylmethyl)amine and rigid pyromellitate ligands

Three new complexes, {[Mn(Hbpma)(2)(pm)(H2O)(2)]center dot 8H(2)O}(n), {[Co(Hbpma)(2)(pm)(H2O)(2)]center dot 8H(2)O}(n) and {[Zn(Hbpma)(2)(pm)(H2O)(2)]center dot 8H(2)O}(n) (bpma = N,N'-bis(3-pyridylmethyl)amine and H(4)pm = pyromellitic acid) were synthesized and structurally characterized by single-crystal X-ray diffraction. All three complexes are isomorphous consisting of one-dimensional coordination polymers bridged by rigid pm ligands, while the flexible dipyridyl bpma only acts as a terminal ligand. The bpma ligand adopts the trans-trans conformation in all three complexes. The magnetic properties of the Mn(II) and Co(II) complexes show the occurrence of antiferromagnetic interactions between adjacent metal atoms. The Zn(II) complex exhibits fluorescent emission in the solid state at room temperature.