Circularly Polarized Luminescence Induced by Hydrogen‐Bonding Networks in a One‐Dimensional Hybrid Manganese(II) Chloride

Chiral hybrid metal halides hold great potential as circularly polarized luminescence light sources. Herein, we have obtained two enantiomeric pairs of one-dimensional hybrid chiral manganese(II) chloride single crystals, R/S-(3-methyl piperidine)MnCl₃ (R/S-1) and R/S-(3-hydroxy piperidine)MnCl₃ (R/S-2), crystallizing in the non-centrosymmetric space group P2₁2₁2₁. In comparison to R/S-1, R/S-2 single crystals not only show red emission with near-unity photoluminescence quantum yield (PLQY) and high resistance to thermal quenching but also exhibit circularly polarized luminescence with an asymmetry factor (g_lum) of 2.5×10^-3, which can be attributed to the enhanced crystal rigidity resulting from the hydrogen bonding networks between R/S-(3-hydroxy piperidine) cations and [MnCl₆]^4- chains. The circularly polarized luminescence activities originate from the asymmetric [MnCl₆]^4- luminophores induced by N-H⋅⋅⋅Cl hydrogen bonding with R/S-(3-hydroxy piperidine). Moreover, these samples demonstrate great application potential in circularly polarized light-emitting diodes and X-ray scintillators. This work shows a highly efficient photoluminescent Mn-based halide and offers a strategy for designing multifunctional chiral metal halides.