3D coordination polymers constructed from d10 metal ions, flexible 1,2,4-triazole derivatives and aromatic tetracarboxylates: Syntheses, structures, thermal and luminescent properties

Abstract

The reaction of mixed-ligands 1,2,4,5-benzene tetracarboxylic acid (H4btec) and 1,2-bis(4-amino-5-methylmercapto-1,2,4-triazole-3-yl)ethane (bamte) with zinc(II) nitrate hexahydrate under hydrothermal conditions led to the formation of the coordination polymer [Zn2 (bamte) (btec)]n (CP1), whereas the reaction of the same organic tetraacid with 4-amino-5-(pyridine-4-yl)-4H-1,2,4-triazole-3-thiol (Haptt) and cadmium (II) nitrate tetrahydrate under solvothermal conditions gave the coordination polymer [Cd3 (aptt)2 (btec)]n (CP2). Both CPs have been characterized by elemental analysis, FT−IR, powder X-ray diffraction as well as single-crystal X-ray diffraction. Both complexes possess three-dimensional (3D) networks based on two-dimensional MII-btec4-- layers connected by multidentate triazole moieties. CP1 shows a rarely observed binodal (4,6)-connected ‘‘fsc’’ coordination network with (44.610.8) (44.62) topology, whereas CP2 presents a new tetranodal (4,4,5,6)-connected 3D net with (43.62.8)2 (44.62) (44.66)2 (46.66.83) point symbol. Furthermore, the morphology, thermal stability, and solid-state luminescent property of both coordination polymers have been investigated.