Effect of N-Donor Ligands and Metal Ions on the Coordination Polymers Based on a Semirigid Carboxylic Acid Ligand: Structures Analysis, Magnetic Properties, and Photoluminescence

Abstract

Seven novel coordination polymers derived from the 3-(3′,5′-dicarboxylphenoxy)phthalic acid (H4L) ligand have been constructed under similar synthesized conditions with Co(II), Zn(II), Cd(II) ions in the presence of N-donor ancillary ligands, namely, [Co2(HL)(4,4′-bipy)(μ3-OH)(μ2-H2O)]n (1), [Co2(L)(dpa)2]n (2), {[Co2(L)(4,4′-bibp)(H2O)4]·H2O}n (3), [Co2(L)(dib)2]n (4), [Co2(L)(bix)1.5]n (5), [Zn2(L)(bix)1.5]n (6), and {[Cd2(L)(bix)0.5(H2O)]·2H2O}n (7). The various topologies of the structures have been generated by adjusting the N-donor ligands and the central metal ions. Complex 1 displays a tfz-d topology with (3,8)-connected structure, and the Schläfli symbol is (43)2(46.618.84). Complex 2 shows a 4-connected structure of sod topology with a Schläfli symbol of (42.64), forming a three-dimensional (3D) 2-fold interpenetrating structure. Complex 3 presents a novel (3,3,4)-connected topology with a Schläfli symbol of (63.83)(63)(83) and shows 2D → 3D supramolecular structure through C–H···O hydrogen bonds. Complex 4 features a four-connected structure of Nbo topology. Complex 5 and 6 are defined as the same novel (4,4,5)-connected topology with a Schläfli symbol of (4.5.6.83)(42.53.6)(43.53.62.72). In addition, complex 7 can be simplified as a (3,8)-connected tfz-d topology with a Schläfli symbol of (43)2(46.618.84). The contrast of 1–5 reveals that the ancillary ligands have key roles in adjusting the crystal structures, and the contrast of 5–7 indicates the central metal ions' influences. Moreover, the magnetic properties of 1–5 and the fluorescence properties of 6 and 7 are discussed.