Here, two novel 3D Cd(II)-MOFs, [Cd3·L·(BTB)2·2DMF]
and [(Cd3O2)·L·BTC] (denoted
as CUST-532 and CUST-533, L = 9,10-bis(N-benzimidazolyl)-anthracene, BTB = 1,3,5-tris(4-carboxyphenyl) benzene, BTC = 1,3,5-benzenetricarboxylic acid, CUST = Changchun University of
Science and Technology), were synthesized by solvothermal conditions.
Both CUST-532 and CUST-533 are 3D (3,8)-c
topological nets with the same point symbol of {43}2{46·618·84}. PXRD
and TGA analyses prove that CUST-532 and CUST-533 have good structural stability and thermal stability. On the basis
of the high fluorescence characteristics, the results of fluorescence
sensing experiments show that CUST-532 and CUST-533 can be used as multifunctional chemical sensors to achieve rapid
fluorescence quenching response to antibiotic residues, Fe3+ and Cr2O7
2– ions at a much
lower concentration. Furthermore, the possible mechanisms of fluorescence
quenching in the sensing process were systematically studied by PXRD,
UV–vis, fluorescence decay lifetime, and density functional
theory.
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