Deep-red phosphorescent organic–inorganic hybrid Mn(II) complexes based on 2-(diphenylphosphoryl)-N,N-diethylacetamide ligand

Two unprecedented organic–inorganic hybrid complexes, [Mn(L)₃]MnCl₄ (1) and [Mn(L)₃]MnBr₄ (2), have been synthesized in 88–92% yields via reaction of Mn(II) halides with Ph₂P(O)CH₂C(O)NEt₂ (L) in a 3:2 M ratio. X-ray diffraction analysis of 2 reveals that the metal ion of the [Mn(L)₃]²⁺ cation has an octahedral geometry, while the [MnBr₄]²⁻ anion contains tetrahedrally coordinated Mn(II). At ambient temperature, the solid complexes 1 and 2 exhibit bright deep-red phosphorescence (λ_max ^em = 660 and 670 nm) with the lifetimes of 3–3.7 ms and photoluminescence quantum yields of 6% and 27%, respectively.