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

• Complexes 1–6 was synthesized via hydrothermal methods.
• Crystal structures and thermal stability of complexes 1–6 have been described.
• Fluorescent properties and magnetic behavior of complexes 1–6 have been studied.
• Mixed ligands play important roles in the construction of complexes 1–6.

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.

Six different coordination polymers based on a main dicarboxyl ligand and auxiliary ligands have been synthesized. According to the analyses of the various architectures, the ligands showed important effects on the constructions of final structures in complexes 1–6.Figure optionsDownload as PowerPoint slide