Syntheses, structures, characterization and photoluminescent properties of six coordination polymers based on multidentate N-donor ligands and polycarboxylate anions

Abstract

A series of coordination polymers constructed from tripodal N-donor ligands and polycarboxylate anions, namely, [Ag6(3,4′-tmbpt)(btc)2]·2H2O (1), [Ag2(3,4′-tmbpt)(H2btec)]·H2O (2), [Ag2(4,4′-tmbpt)(Hbtc)]·H2O (3), [Cd3(4,4′-tmbpt)(btc)2(H2O)6]·7H2O (4), [Co(4,4′-tmbpt)(btec)0.5(H2O)] (5) and [Ni(4,4′-tmbpt)(btec)0.5(H2O)] (6), where 3,4′-tmbpt=1-((1H-1,2,4-triazol-1-yl)methyl)-3-(4-pyridyl)-5-(3-pyridyl)-1,2,4-triazole, 4,4′-tmbpt=1-((1H-1,2,4-triazol-1-yl)methyl)-3,5-bis(4-pyridyl)-1,2,4-triazole, H3btc=1,3,5-benzenetricarboxylic acid, and H4btec=1,2,4,5-benzenetetracarboxylic acid, have been hydrothermally prepared. Single crystal X-ray diffraction analyses indicate that compound 1 exhibits a 3D (3,4,6)-connected framework with (4·62)2(6·85)2(4·62·83·12) topology. Compound 2 has a 3D (3,4)-connected framework with (63)2(42·64)(42·63·8) topology. Compound 3 exhibits a 2D layer structure. Compound 4 shows a 3D 2-fold interpenetrating framework with (6·102) topology. Compounds 5 and 6 exhibit similar 2D→3D polythreading architectures. These compounds have been characterized by infrared spectra (IR), elemental analyses and powder X-ray diffraction (PXRD) analyses. The effects of the organic anions on the structures of the compounds have been discussed. Moreover, the photoluminescent properties of the compounds have been investigated.