Stable CdII-Based Metal-Organic Framework as a Multiresponsive Luminescent Sensor for Acetylacetone, Salicylaldehyde, and Benzaldehyde with High Sensitivity and Selectivity

A class of potential luminescent sensing materials hasbeen graduallydeveloped in the form of luminescent metal-organic frameworks(LMOFs). A new LMOF with the formula {[Cd(BBZB)(bptc)(0.5)]& BULL;2H(2)O}( n ) (JXUST-33, BBZB = 4,7-bis(1H-benzimidazole-1-yl)-2,1,3-benzothiadiazole,H(4)bptc = biphenyl-3,3 & PRIME;,5,5 & PRIME;-tetracarboxylicacid) has been successfully constructed, which exhibits the stabilityof structure and effectiveness of luminescence. Single-crystal X-raydiffraction studies have shown that two adjacent Cd-II ionsare linked by a bptc(4-) ligand in different directionsto form a plane that is further linked by interlaced BBZB ligandsto form a three-dimensional two-fold interpenetrating framework. JXUST-33 can be used as a fluorescent probe to identify variousorganic molecules and detect three different organic compounds bythe fluorescence quenching behavior of its luminescence properties.In addition, mixed substrate films based on JXUST-33 havebeen developed to achieve detection of acac, SA, and BZ via the nakedeye, which has great potential for practical applications. A new stable Cd-II-based LMOF(JXUST-33) has been successfully prepared as a fluorescentsensor for acetylacetone(acac), salicylaldehyde (SA), and benzaldehyde (BZ). In addition,mixed substrate films made from JXUST-33 and polymethylmethacrylate can realize recognition of low-concentration acac, SA,and BZ solvents and gas environments via the naked eye.