Through-Space Charge Transfer in Copper Coordination Networks with Copper-Halide Guest Anions.

We prepared coordination networks that show relatively strong emission with through-space charge-transfer (TSCT) transitions. Thermolysis of a kinetically assembled network with Cu ₂ Br ₂ dimer connectors, which was assembled from a CuBr cluster and the T _d ligand 4-4-tetrapyridyltetraphenylmethane (4-TPPM), generated a highly luminescent network composed of Cu ⁺ connectors and 4-TPPM linkers with CuBr ₂ ^- guests. We clarified that the electronic transitions in this network include TSCT in addition to the typical metal-ligand charge transfer (MLCT) observed in conventional Cu complexes.