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 1/4 4,40-(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.