Syntheses, crystal structures, and properties of three two-dimensional complexes constructed by flexible (2,3-pyridylmethyl)amine

Three two-dimensional coordination polymers [Cd(2,3-Pyma)Cl-2] (n) (I), {[Cd(2,3-Pyma)(1,4-Chdc)] center dot 4H(2)O}n (II) and {[Zn-2(2,3-Pyma)(1,2,4,5-Bttc)(H2O)(4)] center dot 6H(2)O} (n) (III) (2,3-Pyma = (2,3-pyridylmethyl) amine, H-2-1,4-Chdc = 1,4-cyclohexanedicarboxylic acid, and H-4-1,2,4,5-Bttc = 1,2,4,5-benzenetetracarboxylic acid) have been synthesized and structurally characterized by single crystal X-ray crystallography (CIF files CCDC nos. 989461 (I), 1055685 (II) and 1055686 (III)). Three complexes are all twodimensional layer networks bridged by the flexible 2,3-Pyma ligands or the carboxylate ligands. It is noted that the flexible 1,4-Chdc ligands bind the Cd2+ ions into a helical chain structure in complex II. The photoluminescence and thermal properties are investigated.