A Smart Sensing Method for Object Identification Using Circularly Polarized Luminescence from Coordination‐Driven Self‐Assembly |
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| Authors: | Yuki Imai Yuka Nakano Prof Tsuyoshi Kawai Dr Junpei Yuasa |
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| Affiliation: | 1. Department of Applied Chemistry, Tokyo University of Science, Tokyo, Japan;2. Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan |
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| Abstract: | The potential use of circularly polarized luminescence for object identification in a sensor application is demonstrated. New luminescence probes using pyrene derivatives as sensor luminophores were developed. (R,R)‐Im2Py and (S,S)‐Im2Py contain two chiral imidazole moieties at 1,6‐positions through ethynyl spacers (angle between spacers ca. 180°). The probe molecules spontaneously self‐assemble into chiral stacks (P or M helicity) upon coordination to metal ions with tetrahedral coordination (Zn2+). The chiral probes display neither circular dichroism (CD) nor circularly polarized luminescence (CPL) without metal ions. However, (R,R)‐Im2Py and (S,S)‐Im2Py exhibit intense chiroptical activity (CD and CPL) upon self‐assembly with Zn2+ ions. (R,R)‐Im2Py and (S,S)‐Im2Py with chemical stimuli‐responsibility allow sensing using the CPL signal as detection output, enabling us to discriminate between a signal from the target analyte and that from non‐target species. |
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| Keywords: | bio-inspired optical materials circularly polarized luminescence pyrene sensing zinc |
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