Two Isomers with FSC Topology Constructed from Cu6I6(DABCO)4 and Cu8I8(DABCO)6 Building Blocks

Two isomers of copper halides of the framework formula (CuI)7(DABCO)2.5 were prepared by solvothermal methods, and their structures were determined by single-crystal X-ray diffraction. Both of the structures contain two types of secondary building units, which are connected differently giving rise to two three-dimensional structures. These two structures both contain FSC topology, which is only predicted by O'Keeffe in theory, and is the first observation, to our knowledge, of FSC topology in coordination polymers. The formations of these structures show a good example of different connectivity between the building units that can form different structures. The compounds have been characterized by powder X-ray diffraction, elemental analysis, thermogravimetric analysis (TGA), and photoluminescence studies.