An Ideal Detector Composed of Two‐Dimensional Cd(II)–Triazole Frameworks for Nitro‐Compound Explosives and Potassium Dichromate

The two‐dimensional (2D) metal–organic framework (MOF) [Cd(TPTZ)(H 2 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. Complex 1 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 complex 1 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 [4.6 3 .4.6 3 .6 2 .6 4 ].