An Ideal Detector Composed of Two‐Dimensional Cd(II)–Triazole Frameworks for Nitro‐Compound Explosives and Potassium Dichromate. Issue 40 (19th August 2015)

• Record Type: Journal Article
• Authors: Wang, Ying; Cheng, Lin; Liu, Zheng‐Yu; Wang, Xiu‐Guang; Ding, Bo; Yin, Long; Zhou, Bing‐Bing; Li, Ming‐Shu; Wang, Jia‐Xuan; Zhao, Xiao‐Jun
• Is Part Of: Chemistry. Volume 21:Issue 40(2015)
• Page Start: 14171
• Page End: 14178
• Publication Date: 2015-08-19
• Subjects: cadmium -- fluorescence -- metal–organic frameworks -- N ligands -- sensors; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201502167
• Languages: English
• ISSNs: 0947-6539

Abstract

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.