Effect of organic anions on the self-assembly of Zn(ii)-containing coordination polymers based on trigonal N-donor ligands

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A series of coordination polymers, namely, [Zn(2,3′-tmbpt)(o-bdc)(H2O)] (1), [Zn(2,3′-tmbpt)(m-bdc)] (2), [Zn(2,3′-tmbpt)(p-bdc)]·H2O (3), [Zn2(2,3′-tmbpt)(btc)(OH)]·0.5H2O (4), [Zn(2,3′-tmbpt)(btec)0.5]·2H2O (5), [Zn(3,3′-tmbpt)(o-bdc)]·H2O (6), [Zn(3,3′-tmbpt)(m-bdc)(H2O)]·H2O (7), and [Zn2(3,3′-tmbpt)(btc)(OH)(H2O)] (8), where 2,3′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)methyl)-3-(3-pyridyl)-5-(2-pyridyl)-1,2,4-triazole, 3,3′-tmbpt = 1-((1H-1,2,4-triazol-1-yl)methyl)-3,5-bis(3-pyridyl)-1,2,4-triazole, o-H2bdc = 1,2-benzenedicarboxylic acid, m-H2bdc = 1,3-benzenedicarboxylic acid, p-H2bdc = 1,4-benzenedicarboxylic acid, H3btc = 1,3,5-benzenetricarboxylic acid, and H4btec = 1,2,4,5-benzenetetracarboxylic acid, have been synthesized under hydrothermal conditions. The structures of 1–8 have been determined by single-crystal X-ray diffraction analyses and were further characterized by infrared spectroscopy (IR), elemental analyses and powder X-ray diffraction (PXRD) analyses. Compounds 1 and 6 display 1D chain structures. Compound 2 shows a 3D 2-fold interpenetrating CdSO4 framework. Compound 3 reveals a 2D 2-fold interpenetrating square layer (sql) structure. Compound 4 exhibits a 3D 2-fold interpenetrating framework with (63)(69·8) topology. Compound 5 shows a non-interpenetrating 3D framework with (83)(85·10) topology. Compound 7 has a 2D layer structure. Compound 8 displays a 3D 2-fold interpenetrating framework with (4·62)(42·68·85) topology. The structural discrepancies of compounds 1–8 imply that the organic anions play an important role in the formation of the resultant structures of the coordination polymers. The luminescent properties of compounds 1–8 have also been investigated.