An Ideal Detector Composed of Two‐Dimensional Cd(II)–Triazole Frameworks for Nitro‐Compound Explosives and Potassium Dichromate. Issue 40 (19th August 2015) - Wang, Ying
Abstract: The two‐dimensional (2D) metal–organic framework (MOF) [Cd(TPTZ)(H2 O)2 (HCOOH)(IPA)2 ] n (1 ; TPTZ={4‐[4‐(1 H ‐1, 2, 4‐triazol‐1‐yl)phenyl]phenyl}‐1 H ‐1, 2, 4‐triazole, IPA=isophthalic acid) has been constructed with the π‐electron‐rich aromatic ligand TPTZ, auxiliary ligand IPA, and the metal Cd 2+ ion with a d 10 configuration under solvothermal conditions. Complex1 exhibits a strong ligand‐originated photoluminescence emission, which is selectively sensitive toward electron‐deficient nitroaromatic compounds, such as nitrobenzene (NB), 1, 3‐dinitrobenzene ( m ‐DNB), and 1, 4‐dinitrobenzene ( p ‐DNB), and nitro‐aliphatic compounds, such as nitromethane (NM) and tris(hydroxymethyl)nitromethane. This property makes complex1 a potential fluorescence sensor for these chemicals. Single‐crystal X‐ray diffraction studies revealed that dinuclear cadmium building units were further bridged by TPTZ ligands to give a four‐connected uninodal net with the Schläfli symbol of [4.63 .4.63 .62 .64 ]. Abstract : Explosive findings : The luminescent emissions of a 2D Cd II ‐based metal–organic framework (MOF, see figure) with a C 3 ‐symmetric multicarboxylate ligand can be quenched by trace amounts of nitro compounds and K2 Cr2 O7 . The quenching mechanism is attributed to electron transfer from the excited‐state electron‐donating MOF framework to electron‐withdrawing nitroaromatic explosives and the highly dispersible nature of the MOF particles.