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A Smart Sensing Method for Object Identification Using Circularly Polarized Luminescence from Coordination‐Driven Self‐Assembly
Author(s) -
Imai Yuki,
Nakano Yuka,
Kawai Tsuyoshi,
Yuasa Junpei
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201803833
Subject(s) - luminescence , circular dichroism , chirality (physics) , metal ions in aqueous solution , chemistry , luminescent measurements , ion , molecule , pyrene , coordination complex , metal , crystallography , materials science , physics , optoelectronics , organic chemistry , chiral symmetry breaking , quantum mechanics , nambu–jona lasinio model , quark
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)‐Im 2 Py and (S,S)‐Im 2 Py 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 (Zn 2+ ). The chiral probes display neither circular dichroism (CD) nor circularly polarized luminescence (CPL) without metal ions. However, (R,R)‐Im 2 Py and (S,S)‐Im 2 Py exhibit intense chiroptical activity (CD and CPL) upon self‐assembly with Zn 2+ ions. (R,R)‐Im 2 Py and (S,S)‐Im 2 Py 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.