Ligands effect on the structures of A series of coordination polymers: Syntheses, structures, luminescence and magnetism

Abstract

Six coordination polymers, namely, Mn(dpd)(bpy)(H2O) (1), Co(dpd)(bpy) (2), Cu(dpd)(H2dpd)(bpy) (3), Mn(dpd)(phen)2(H2O) (4), Co(dpd)(phen)(H2O) (5), Co(dpd)(phen)(H2O) (6) (H2dpd=2,4-diphenyl ether dicarboxylic acid, bpy=2,2′-bipyridine, phen=1,10-phenanthroline) have been synthesized under similar hydrothermal conditions by H2dpd, auxiliary ligands and different transition metal salts. Complex 1 is a 3D (3,3)-connected framework which is connected by dpd2− ligand. Complex 2 shows 1D zigzag chain, which is further connected by hydrogen bonds to form a 3D supramolecular net. Complex 3 is constructed from infinite 1D chains which are linked by dpd2− ligand exhibiting a 2D supramolecular layer. Complex 4 is a mononuclear structure which is further self-assembled through hydrogen bonding and π···π stacking interactions to generate a 3D supramolecular structure. Complexes 5 and 6 are 1D chains and further connected by hydrogen bonding and π⋯π stacking interactions to form a 3D supramolecular structure. These complexes have been characterized by elemental analysis, infrared (IR), thermal gravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single crystal X-ray diffraction. Furthermore, UV–Vis spectra and fluorescence properties of 1–6 have been investigated. Magnetic susceptibility measurements indicate that complexes 2–6 all show weak ferromagnetic behaviors.