A magnesium MOF as a sensitive fluorescence sensor for CS2 and nitroaromatic compounds

Abstract

Presented here are the hydrothermal synthesis, structural characterization, and luminescent and gas adsorption properties of a magnesium metal–organic framework compound, namely Mg₅(OH)₂(BTEC)₂(H₂O)₄·11H₂O (1, H₄BTEC = 1,2,4,5-benzenetetracarboxylic acid). The structure of 1 features a three-dimensional network constructed from the linkage of BTEC ligands and rare pentanuclear magnesium clusters as secondary building units, giving rise to the 1D channels along the a axis. Luminescence studies revealed that compound 1 demonstrated high fluorescence sensing of carbon disulfide (CS₂) and nitroaromatic compounds, that is, the fluorescence intensities were almost completely quenched only at the concentrations of 0.8 vol% of CS₂ and 0.04 vol% of nitrobenzene.