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

Article abstract of DOI:10.1039/c2ce25907a

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 (6 ³)(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. This journal is