Three Transition Metal(II) Coordination Polymers Constructed by a Semi‐rigid Bis‐pyridyl‐bis‐amide and Dicarboxylates Mixed Ligands: Assembly, Structures and Properties

Abstract

AbstractThree coordination polymers, namely [Co(BDC)(L)]·H2O (1), [Co(NPH)(L)]·H2O (2), and [Ni(NPH)(L)(H2O)3]·H2O (3) [H2BDC = 1, 3‐benzenedicarboxylic acid, H2NPH = 3‐nitrophthalic acid, L = N,N′‐bis(3‐pyridyl)‐terephthalamide] were hydrothermally synthesized by self‐assembly of cobalt/nickel chloride with a semi‐rigid bis‐pyridyl‐bis‐amide ligand and two aromatic dicarboxylic acids. Single crystal X‐ray diffraction analyses revealed that complexes 1 and 2 are two‐dimensional (2D) coordination polymers containing a one‐dimensional (1D) ribbon‐like Co‐dicarboxylate chain and a 1D zigzag Co‐L chain. Although the coordination numbers of CoII ions and the coordination modes of two dicarboxylates are different in complexes 1 and 2, they have a similar 3, 5‐connected {42.67.8}{42.6} topology. In complex 3, the adjacent NiII ions are linked by L ligands to form a 1D polymeric chain, whereas the 1D chains does not extend into a higher‐dimensional structure due to the ligand NPH with monodentate coordination mode. The adjacent layers of complexes 1 and 2 and the adjacent chains of 3 are further linked by hydrogen bonding interactions to form 3D supramolecular networks. Moreover, the thermal stabilities, fluorescent properties, and photocatalytic activities of complexes 1–3 were studied.