Copper and manganese complexes based on 1,4-naphthalene dicarboxylic acid ligand and its derivative: Syntheses, crystal structures, and magnetic properties

Three new metal-organic coordination polymers, {[Mn-2(1,4-NDC)(2) (C2H5OH) (DMF) (HO2O)]center dot CH3OH}(n) (1), {[1Mn(III)(1,4-NDC)(C(2)Fi(5)O)][Mn(II)(1,4-NDC)(DMF)(H2O)]}(n) (2) and {[Cu-2(G(13)H(9)O(4))(4)(H2O)(2)]}(n)(3) based on1,4-H2NDC and its derivative were hydrothermally synthesized (1,4-H2NDC = 1,4-naphthalene-dicarboxylic acid, C13H10O4 = 4-methyl formate-1-naphthalenecarboxylic acid), and characterized by techniques of single crystal X-ray diffraction, infrared spectra (IR), elemental analysis, powder X-ray diffraction(PXRD) and variable-temperature magnetic susceptibility measurements. X-ray crystal structure analyses reveal that complexes 1 and 2 show a same 3,5-connected fsc 3D topology network with the Schrafli symbol of {4.6.8}{4.6(6.)8(3)}. But, the valence of some Mn atom in complex 2 take place transition from the +II oxidation state to the +III oxidation state, which may be the effect of the different solvent ratio. In complex 3, the Cu center dot center dot center dot Cu distance of 2.620(13) angstrom is significantly shorter than the sum of the van der Waals radii of Cu (1.40 angstrom), resulting in a strong ferromagnetic interaction between the Cu(II) centers. Furthermore, the temperature-dependent magnetic susceptibility measurements exhibit overall antiferromagnetic interactions between manganese ions for complexes 1 and 2, and a strong ferromagnetic interaction between the Cu(II) centers for complex 3. (C) 2017 Elsevier B.V. All rights reserved.