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.