Abstract
Two Zn-MOFs, {Zn(TDC)(TPB)0.5·H2O}n (1) and {[Zn2(2,6-NDC)2(TPB)]·MeCN·3H2O}n (2) (TPB = 1,2,4,5-tetra(4-pyridyl)benzene, H2TDC = 2,5-thiophenedicarboxylic acid, 2,6-H2NDC = 2,6-naphthalic acid), have been synthesized by a semi-rigid tetrapyridine ligand and auxiliary dicarboxylic ligands. They were characterized by single crystal and powder X-ray diffractions, elemental analysis, FT-IR and TGA. Structurally, 1 features a rare (4, 4)-connected 2-fold interpenetrating three-dimensional (3D) framework with the point symbol of (66)2(64, 82). 2 shows an unprecedented (4, 4)-connected 3-fold interpenetrating 3D architecture with the point symbol of (4, 62, 73)2(42, 62, 82). The different structures between 1 and 2 can be attributed to distinct bridging angles from auxiliary dicarboxylic ligands. Luminescence sensing experiments exhibit that 1 can detect TNP with high sensitivity and selectivity. The detection mechanism of 1 towards TNP has been discussed. More importantly, the test paper experiment provides a simple and reliable detection method for TNP in practical applications.
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