A three-dimensional Cd() metal-organic framework: a bifunctional luminescence sensor for benzaldehyde and Fe ions

A solvothermal reaction between Cd(NO 3 ) 2 ·4H 2 O and the bifunctional ligand 3,5-bis-(1 H -1,2,4-triazol-1-yl)benzene carboxylic acid (HTBC) afforded a three-dimensional coordination polymer, namely [Cd 0.5 (TBC)] n ( 1 ). Single-crystal X-ray diffraction analyses exhibited that MOF 1 possesses a 3D framework with rtl topology, which exists in the form of 2-fold interpenetrated networks. Its luminescence properties demonstrated that complex 1 is a very suitable MOF for the luminescence probing of Fe 2+ cations over other metal cations with a high quenching-efficiency constant K SV value of 1.35 × 10 5 M −1 and a low fluorescence detection limit. In addition, complex 1 also exhibits the highly selective and visually sensitive sensing of the organic contaminant PhCHO with good reusability and a low detection limit. What's more, this is a regenerable luminescent sensor for the highly selective, sensitive sensing of Fe 2+ over Fe 3+ . A three-dimensional Cd( ii ) MOF has been constructed. It is (3,6)-connected net showing rtl topology. In addition, it is also a bifunctional luminescence sensor for benzaldehyde and Fe 2+ ions.