A novel trinuclear Cd(ii) cluster-based metal–organic framework: synthesis, structure and luminescence properties

Abstract

A novel three-dimensional metal–organic framework (MOF), [H₃O][Cd₃Cl(PZC)₃(H₂O)₃] (1), has been synthesized based on a trinuclear Cd(II) cluster and H₂PZC ligand (H₂PZC = 1H-pyrazole-4-carboxylic acid). Compound 1 crystallizes in a trigonal crystal system with the space group R3m. Trinuclear Cd(II)-clusters as secondary building units (SBU) are further connected by the H₂PZC ligand to form a two-fold interpenetrated 3D framework. Compound 1 exhibits excellent water-stability and good luminescence properties for various organic solvents and different metal ions. The systematic investigation for luminescence indicates that compound 1 possesses unique performance for the detection of acetone, Fe²⁺ and Na⁺ based on a fluorescence quenching and enhancing mechanism, thus it can be regarded as a potential luminescence probe for the detection of acetone, Fe²⁺ and Na⁺.