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首页> 外文期刊>Chemistry: A European journal >Plasmonic Activation of a Fluorescent Carbazole–Oxazine Switch
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Plasmonic Activation of a Fluorescent Carbazole–Oxazine Switch

机译：血浆咔唑-恶嗪开关的等离子激活

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摘要

The covalent attachment of a carbazole fluorophore to an oxazine photochrome permits the reversible activation of fluorescence under optical control. Ultraviolet irradiation with a pulsed laser opens the oxazine ring to shift bathochromically the absorption of the carbazole component. Concomitant visible illumination excites selectively the carbazole fluorophore of the photochemical product to produce fluorescence. The photogenerated and fluorescent species reverts spontaneously on a submicrosecond timescale to the initial nonemissive state of the carbazole–oxazine dyad. The photochemical and photophysical properties engineered into this particular molecular switch allow the convenient monitoring of plasmonic effects on photochemical reactions with fluorescence measurements. In close proximity to silver nanoparticles, visible illumination with a continuous-wave laser also results in fluorescence activation. The metallic nanostructures enable the two-photon excitation of the oxazine component to induce the photochromic transformation and then facilitate the one-photon excitation of the photochemical product to generate fluorescence. Thus, these operating principles offer the opportunity to avoid altogether the need of pulsed ultraviolet irradiation to trigger the photochromic transformation and, instead, allow fluorescence activation with a single visible source operating at low illumination power.
机译：咔唑荧光团与恶嗪光致色素的共价连接使得在光学控制下可逆激活荧光。脉冲激光的紫外线照射会打开恶嗪环，从而使染料发生红移，从而使咔唑组分的吸收发生红移。伴随的可见光照明选择性地激发光化学产物的咔唑荧光团以产生荧光。光生和荧光物质在亚微秒级上自发地还原为咔唑-恶嗪二聚体的初始非发射态。工程化到此特定分子开关中的光化学和光物理特性允许通过荧光测量方便地监控等离子体对光化学反应的影响。在紧邻纳米银颗粒的地方，连续波激光的可见光照射也会导致荧光激活。金属纳米结构使得恶嗪组分的双光子激发能够诱导光致变色转变，然后促进光化学产物的单光子激发以产生荧光。因此，这些操作原理提供了完全避免脉冲紫外线照射以触发光致变色转变的机会，而是可以使用在低照明功率下工作的单个可见光源来激活荧光。

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