Two Series of Isostructural Coordination Polymers with Isomeric Benzenedicarboxylates and Different Azine Based N,N′-Donor Ligands: Syntheses, Characterization and Magnetic Properties

Seven coordination polymers (CPs) with two types of framework structures, namely, {[M(4-bpdb)(1,3-bdc)]·(4-bpdb)0.5}n [M = Mn (1), Fe (2), and Co (3)], and {[M(4-bpdh)(1,4-bdc)]}n (M = Mn (4), Fe (5), Co (6), and Cd (7)] have been synthesized through the slow diffusion technique using 1,3-bdc and 1,4-bdc ligands with two different azine based N,N′-donor linkers [1,3-bdc = benzene-1,3-dicarboxylate, 1,4-bdc = benzene-1,4-dicarboxylate, 4-bpdb = N,N′-bis-pyridin-4-ylmethylene-hydrazine and 4-bpdh = N,N′-bis-(1-pyridin-4-yl-ethylidene)-hydrazine]. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra, and powder X-ray diffraction (PXRD) analysis. Compounds 1–3 are isostructural and feature a two-dimensional (2D) framework structure formed by pillaring the one-dimensional [M(1,3-bdc)]n double chains through 4-bpdb linkers. In all cases of compounds 1–3, free 4-bpdb linkers are present in the lattice and lattice 4-bpdb lig...