N-donor ligand driven CdII-based coordination polymers: Synthesis, structures and highly selective luminescence sensing for Fe3+ ions

Abstract

Three CdII-based coordination polymers (CPs), formulated as [Cd2(dnpdc)3(DMSO)3·0.5H2O]n (1), [Cd(dnpdc)(bpee)] n (2) and {Cd(dnpdc)(bimb)·2H2O}n (3) have been successfully synthesized and structurally characterized. Compound 1 exhibits a 4-fold interpenetrated 3D diamond network based on dinuclear Cd2(OCO)3 cluster. Compound 2 features 3D frameworks constructed from the 2D [Cd(dnpdc)]n sheets pillared by 1D zig-zag shaped [Cd(bpee)]n chains. In compound 3, the mononuclear CdII units are mixed connected by the dnpdc2− and bimb ligands, yielding the 6-fold interpenetrated 3D diamond network. The fluorescence measurements reveal that three compounds exhibit intense blue emission in the solid state. In particular, compound 3 exhibits highly selective chemical sensing for Fe3+ ions in aqueous solution.