A new cluster-based metal-organic framework with triazine backbones for selective luminescent detection of mercury(II) ion

Abstract A new cluster-based metal–organic framework (MOF) [(Me 2 NH 2 )Cd 3 (OH)(H 2 O) 3 (TATAB) 2 ](DMA) 6 ( 1 , DMA =  N , N -dimethylacetamide) with triazine backbones has been successfully prepared using the 4,4′,4″-s-triazin-1,3,5-triyltri- p -aminobenzoic acid (H 3 TATAB) as the organic spaces. The as-prepared 1 was characterized by elemental analysis, powder X-ray diffraction, single-crystal X-ray diffraction and thermogravimetric analysis. The X-ray study result reveals that complex 1 belongs to the tetragonal space group P4 3 2 1 2 and shows a three-dimensional channel-type framework. The luminescent responses of 1 respect to different metal ions were studied, which reveals that 1 shows highly selective and sensitive detection of Hg 2+ via an obvious fluorescence quenching and red-shift of the emission peak. Furthermore, the possible sensing mechanism has also been discussed in this work.