Excimer and exciplex formation in a pair of bright phosphorescent isomers constructed from Cu3(pyrazolate)3 and Cu3I3 coordination luminophores

Abstract

Reported herein are a pair of supramolecular pseudo-isomers, namely, (Cu₃I₃)(Cu₃L₃)₂·H₂O (1) and (Cu₃I₃)(Cu₃L₃)₂ (2) (L = 3-(4-pyridyl)-5-isobutyl-pyrazolate), both of which incorporate Cu₃Pz₃ (Pz = pyrazolate) and Cu₃I₃ clusters as luminophores. The two complexes show distinct yellow (570 nm) and orange (638 nm) emissions, which are ascribed to the formation of the excimer and exciplex involving the same or different copper(I)-cluster-based luminophores.