Three New Metal–Organic Polymers Based on Flexible 3-(4-(Carboxymethoxy) Phenyl) Propanoic Acid: Crystal Structures, Luminescent and Magnetic Properties

Three new metal–organic coordination complexes, [Zn2L(bpp)2Cl2]n (1), [ZnL(bipy)]n (2), [NiL(bipy)(H2O)]n (3), have been synthesized through hydrothermal reactions of flexible 3-(4-(carboxymethoxy)phenyl) propanoic acid(H2L) with different pyridyl-containing 1,3-bis(4-pyridyl)propane(bpp) or 4,4′-bipyridine(bipy) ligand, and they are characterized by elemetal analysis and single-crystal X-ray diffraction techniques. Complex 1 has a 2-D layer supramolecular network composed of 1-D distorted trapezoidal chains via C–H···π stacking interactions. Complex 2 displays a 2-D lattice-shaped layer structure. Complex 3 has three kinds of O–H···O intermolecular hydrogen bonds, exhibiting a 3-D supramolecular framework. The luminescent properties of complex 1 and 2 have indicated the mixture characteristic of intraligand and ligand-to-ligand charge transition. The magnetic property of 3 has shown the ferromagnetic coupling between Ni2+ ions.