Barium Complex In Situ Synthesized from 1,4,5,8-Naphthalene Tetracarboxylic Acid: Structure, Detection of Aromatic Amines, and Use as a Precursor of Nano BaCO3

Using 1,4,5,8-naphthalene tetracarboxylic acid as a raw material, a luminescent barium-based metalorganic framework (MOF), [Ba(dna)(H2O)(2)](n) (1, H(2)dna=1,8-naphthalic anhydride-4,5-dicarboxylic), with a 3D topological structure was synthesized by in situ reaction under solvothermal conditions, and characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analysis, and powder X-ray diffraction. The structural analysis demonstrates that it has the underlying 3D topology, encompassing a pi-conjugated organic ligand with an anhydride group. It exhibited a low detection limit for aromatic amines in an aqueous solution, which may be driven by an anhydride amine reaction between the ligand and the hosted amines, with a significant enhancement of the emission intensity and visual color change. Furthermore, micro - crystalline BaCO, particles can be prepared through direct calcination of complex 1 as a precursor at moderately elevated temperatures.