Three 2 D copper(II)/cadmium(II) coordination polymers based on semi-rigid/flexible bis-pyridyl-bis-amide ligands and 5-aminoisophthalate : syntheses, structures and properties / created by Hongyan Lin, Huizhe Lu, Mao Le, Jian Luan, Xiuli Wang and Cuocheng Liu

Three new transition metal coordination polymers [Cu(3-bpcb)0.5(5-AIP)] ⋅2H2O (1), [Cd(3-bpc b)0.5(5-AIP)(H2O)] ⋅H 2O (2) and [Cd(3-bpsa)0.5(5-AIP)(H2O)] ⋅2H2O (3) have been hydrothermally synthesized by self-assembly of 5-aminoisophthalic acid (5-H2AIP), semi-rigid or flexible bis-pyridyl-bis-amide ligands [3-bpcb = N N ′-bis(3-pyridinecarboxamide)-1,4-benzene, 3-bpsa = N,N ′-bis(3-pyridyl)succinamide], and copper chloride or cadmium nitrate. X-ray diffraction analysis reveals that compounds 1 and 2 possess similar 2 D double-layered structures with (3,4)-connected (63)(65⋅8) topology, while compound 3 displays a 2 D layer with {62.10}{6} topology. The adjacent layers of 1–3 are finally extended into 3 D supramolecular frameworks by hydrogen bonding interactions. The bis-pyridyl-bis-amide ligands with different flexibilities play an important role in the construction of final topological structures for the title compounds. Further, the electrochemical behavior of the compound 1 and the fluorescent and photocatalytic properties of compounds 1–3 have been investigated.