Metal-directed assembly of 1-D and 2-D coordination polymers with fluconazole and dicyanamide co-ligand

The coordination chemistry of a flexible poly(triazolyl)alkane derivative, fluconazole (HFlu), with a series of transition metal ions and dicyanamide (dca) anionic co-ligand has been explored to afford six new metal–organic coordination polymers. Complexes [M(HFlu)2(dca)2]n (M = MnII for 1, FeII for 2, CoII for 3, ZnII for 5, and CdII for 6) have the isostructural 1-D double-chain array via bridging fluconazole, whereas [Cu3(Flu)2(dca)4(CH3OH)2]n (4) shows an unusual 2-D layered metal–organic framework with dimeric CuII subunits. Notably, both types of coordination patterns are extended into distinct 3-D supramolecular networks via hydrogen-bonding interactions. This result indicates that the choice of metal ion has a significant effect on these polymeric structures as well as the binding modes of the ligands, which is discussed in detail. The ZnII and CdII complexes 5 and 6 display similar fluorescent emissions at 260 nm in the solid state, which essentially are intraligand transitions.