Three-Dimensional Photoluminescent Frameworks Constructed from Size-Tunable CuI Clusters

Reported here are three 3-D copper iodide frameworks, (Cu(4)I(4))(DABCO)(2)(solvent)(x), (1), (Cu(6)I(6))(Cu(8)I(8))(DABCO)(5)-(imidazole) (2), and (Cu(2)I(2))(1/2)(Cu(5)I(5))(DABCO)(2) (3), constructed with DABCO ligands (DABCO = 1, 4-diazabicyclo-[2.2.2]-octane) and various neutral CuI clusters. 1,2. and 3 display an interpenetrating diamond-type net, a 5-connected interpenetrating net, and a (4,6)-connected net, respectively. The variations in Cu(+) coordination numbers (2, 3, and 4), cluster types, and framework topologies are achieved by tuning reactant ratios and by employing different mixed solvents. Compound 3 displays chiral symmetry, while compound 2 shows photoluminescence at 298 K.