Circularly Polarized Luminescence from Achiral Single Crystals of Hybrid Manganese Halides

Abstract

[K(dibenzo-18-crown-6)]⁺ (<b>KC</b>) cations are used for cocrystallization with manganese halides, producing isostructural single crystals of organic-inorganic hybrid complexes, [K(dibenzo-18-crown-6)]₂MnX₄ (abbreviated <b>(KC)</b>_<b>2</b><b>MnX</b>_<b>4</b>) (X = Cl, Br), which feature one-dimensional morphology and green phosphorescence with considerable photoluminescence quantum yields accompanied by excellent optical waveguide behavior with a low loss coefficient. More interestingly, <b>(KC)</b>_<b>2</b><b>MnX</b>_<b>4</b> crystallizes in the monoclinic space group <i>Cc</i> belonging to the achiral point group <i>m</i> (<i>C</i>_<i>s</i>), where the non-centrosymmetric arrangement of racemic units, with right- and left-handed rotating optical axes, endows these achiral single crystals with circularly polarized luminescence, observed for the first time.