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Published on: April 12, 2019
Harnessing Reversible 0D-1D Transformation in Chiral Mn(II) Halides for Smart Circularly Polarized Luminescence
Jinyang Li1, Kele Liao1, Qinghong Zeng1
1Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, China.
Abstract:
Circularly polarized luminescence (CPL) active materials with dynamically tunable properties are highly desirable for next-generation photonics and encryption technologies, yet achieving this through predictable solid-state structural transformations remains a formidable challenge. Herein, we demonstrate a novel dimensionality-engineering strategy to realize stimuli-responsive CPL in chiral hybrid Mn(II) halides. Employing a single chiral cation, R/S-3-methylmorpholine, we selectively synthesized two distinct phases: a red-emissive 1D chain structure with octahedral Mn(II) centers and a green-emissive 0D structure with tetrahedral coordination. Remarkably, the 0D phase undergoes a rapid and reversible ethanol-assisted thermal transformation into the 1D phase, accompanied by a striking CPL color switch from green to red. This unique behavior stems from a stimulus-induced recoordination of Mn-Cl units and reorganization of the hydrogen-bonding network. Capitalizing on this reversible response and intrinsic chirality, we engineered a sophisticated multilevel photonic encryption platform, encompassing binary dot-matrix coding, dual-channel (photoluminescence/CPL) Morse code, and CPL-based ASCII decryption. This work establishes structural dimensionality control as a powerful paradigm for creating intelligent, CPL-active materials, opening new avenues for high-security optical information technologies.
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