Dual luminescence in solid Cui(piperazine): Hypothesis of an emissive 1-D delocalized excited state
Résumé
Solid [CuI(piperazine)0.5]∞, characterized by a structure with an infinite double chain of CuI, presents an unexpected dual luminescence. The short copper-copper distances allow the existence of both cluster-centered and 1-D delocalized electronic transitions, as emerged from theoretical calculations. Beyond the more common cluster-centered emission a higher energy band, which differs in lifetime and in temperature dependence, is observed. © The Royal Society of Chemistry 2015.