A novel DyIII-based metal-organic framework as the multi-responsive luminescent sensor for acetylacetone and salicylaldehyde

A novel DyIII-based metal-organic framework, namely [(H3O)Dy(BTDB)2(DMF)(H2O)]n (JXUST-24, H2BTDB ​= ​4,4′-(benzo[c][1,2,5]thiadiazole-4,7-diyl)dibenzoic acid), was prepared and structurally characterized. Single-crystal structure determination reveals that JXUST-24 is a one-dimensional chain-based complex. JXUST-24 is a excellent luminescent sensor to identify acetylacetone (acac) by the fluorescence enhancement and blue-shift effect with the detection limit of 14.7 ​ppm, and salicylaldehyde (SA) by the fluorescence quenching effect with the detection limit of 17.9 ​ppm, respectively. The sensing process is mainly attributed to the formation of exciplex and charge transfer for acac and photoinduced electron transfer and competitive absorption mechanism for SA. Importantly, JXUST-24 can be reused after five cycles, indicating the good cyclic performance.