Self-assembly of 2D zinc(II) and manganese(II) complexes with flexible 3-carboxymethoxy phenyl acrylic acid and 4,4′-bipyridine

Two new two-dimensional (2D) metal–organic frameworks constructed from mixed 3-carboxymethoxy phenyl acrylic acid (3-H2cpa) and 4,4′-bipyridine (4,4′-bipy) ligands, [Zn(3-cpa)(4,4′-bipy)0.5]n (1) and [Mn(3-cpa)(4,4′-bipy)0.5(H2O)2]n (2), have been synthesized under hydrothermal condition and characterized by elemental analyses, IR, and single crystal X-ray diffraction techniques. Complex 1 presents a 2D layer framework along the (1 0 0) plane, which is derived from paddle wheel units Zn2(COO)4 as secondary building units (SBUs) linked further by 3-cpa and 4,4′-bipy ligands. Complex 2 shows a 2D polymeric framework assembled by wave-like [Mn(3-cpa)]n chains and linear 4,4′-bipy ligands. The luminescence property of 1 in the solid state has been further studied, and result reveals that it displays luminescent property in the green region.