New Tetraiodomanganate(II) with Highly Efficient Short-Lived Phosphorescence

Abstract

Biphosphonium tetraiodomanganate(II) [DPEPhosMe₂]MnI₄ has been synthesized by the reaction of MnI₂ with bis(phosphonium) salt [DPEPhosMe₂]I₂, which is prepared by the alkylation of DPEPhos with methyl iodide. At ambient temperature, polycrystalline samples of [DPEPhosMe₂]MnI₄ exhibit bright green phosphorescence (λ_max = 546 nm) with a quantum yield of 77%. The phosphorescence decay lifetime is 45 μs, which is rather short for Mn²⁺-centered phosphorescence.