Synthesis and characterization of metal(II)–fluconazole complexes: Chain-like structure and photoluminescence

Three coordination polymers (flu)2CuBr2·2H2O (1), (flu)2Zn(ClO4)2·2H2O (2), (flu)4Ni2(H2O)4(Mo8O26) · 6H2O (3), (flu = fluconazole) have been hydrothermally synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. Compounds 1–3 exhibit similar one dimensional chain-like structures linked by double stranded fluconazole-bridge. In the self-assembly of compounds 1–3, the introduction of anions with different sizes and geometrical configurations lead to the flexible C–C chain of fluconazole to be rotated for suitable position and angle to hold them. Similar inter-chain hydrogen bonding interactions are observed in compounds 1 and 2, whereas compound 3 exhibits a different three dimensional supramolecular architecture in which different chains are linked by [Mo8O26]4− via hydrogen bonding interactions. Complex 1 is nonemissive at room temperature and compounds 2–3 exhibit different photoluminescence properties.