A novel [Dy4(OH)4]-based porous coordination polymer with double-wall structure: Topology structure, fluorescence and magnetic properties

A novel [Dy4(OH)4]-based porous coordination polymer with double-wall structure, [Dy(OH)(cppc)]n (1) (H2cppc = 5-(4-carboxyphenyl)pyridine-2-carboxylic acid), has been successfully obtained through solvo-thermal method and characterized by elemental analysis, IR spectrum, powder X-ray diffraction, single-crystal X-ray diffraction and thermal analysis. Structure analysis shows compound 1 is a three-dimensional porous coordination polymer with double-wall structure constructed by [Dy4(OH)4]8+ cubane-like units and (cppc)2− anions, in which one-dimensional square channels with the dimensions 11.78 × 11.78 A2 are observed. Topology analysis reveals compound 1 has an unprecedented (3, 12)-connected topology net with Schlafli symbol {420.628.818}{43}4. Thermal analysis indicates the framework of compound 1 kept thermally stable until 370 °C. Fluorescent experiment indicates that compound 1 show apparently blue light emission in the solid state. Variable-temperature magnetic susceptibility measurement indicates strong antiferromagnetic interactions in [Dy4(OH)4]8+ SBU for compound 1.