A Smart Sensing Method for Object Identification Using Circularly Polarized Luminescence from Coordination-Driven Self-Assembly
A Smart Sensing Method for Object Identification Using Circularly Polarized Luminescence from Coordination-Driven Self-Assembly
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DOI：
10.1002/anie.201803833
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发表时间：
2018-07-16
影响因子：
16.6
通讯作者：
Yuasa, Junpei
中科院分区：
文献类型：
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作者：
Imai, Yuki;Nakano, Yuka;Yuasa, Junpei
圆偏振发光在传感器应用中用于物体识别的潜在用途被证明。研制了以芘衍生物为传感光团的新型发光探针。（R，R）-Im(2)Py和（S，S）-Im(2)Py通过乙基间隔物（间隔物之间的夹角约180度）在1,6位含有两个手性咪唑基团。探针分子与具有四面体配位的金属离子（Zn2+）配位后，自发自组装成手性堆栈（P或M螺旋）。在不含金属离子的情况下，手性探针既不显示圆二色性，也不显示圆偏振发光。然而，（R，R）-Im(2)Py和（S，S）-Im(2)Py在与Zn2+离子自组装后表现出强烈的热带活性（CD和CPL）。具有化学刺激责任的（R，R）-Im(2)Py和（S，S）-Im(2)Py允许使用CPL信号作为检测输出进行传感，使我们能够区分来自目标分析物和非目标物种的信号。
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 degrees). 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)-Im(2)Py and (S,S)-Im(2)Py exhibit intense chiroptical activity (CD and CPL) upon self-assembly with Zn2+ 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.