Syntheses, structures and characterizations of two Ln(III)-3,5-dichlorobenzoate coordination polymers

Two novel lanthanide complexes, [La3(L)8(phen)(OH)(H2O)]n (1) and [Dy(L)3(EtOH)]n (2) (HL = 3,5-dichlorobenzoic acid, phen = phenanthroline), have been solvothermal synthesized and characterized by single-crystal X-ray diffraction, infrared spectroscopy, element analyses, powder X-ray diffraction and thermal gravimetric analyses. Complex 1 affords one-dimensional chains with hexanuclear La6 units which are peculiar in the coordination chemistry of La(III) and extended into a 3D supramolecular network via π–π stacking and hydrogen-bonding interactions. Whereas complex 2 gives 1D Dy chains, which are in turn bridged by double and quadruple carboxylate of L ligands and construct a 2D layer by weak hydrogen bonds. In addition, magnetic studies reveal antiferromagnetic behavior for complex 2.