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 = Mn-II for 1, Fe-II for 2, Co-II for 3, Zn-II for 5, and Cd-II for 6) have the isostructural 1-D double-chain array via bridging fluconazole, whereas [Cu-3(Flu)(2)(dca)(4)(CH3OH)(2)](n) (4) shows an unusual 2-D layered metal-organic framework with dimeric Cu-II 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 Zn-II and Cd-II complexes 5 and 6 display similar fluorescent emissions at 260 nm in the solid state, which essentially are intraligand transitions. (c) 2006 Elsevier B.V. All rights reserved.