LED based NMR illumination device for mechanistic studies on photochemical reactions - Versatile and simple, yet surprisingly powerful
LED based NMR illumination device for mechanistic studies on photochemical reactions - Versatile and simple, yet surprisingly powerful
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DOI：
10.1016/j.jmr.2013.04.011
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发表时间：
2013-07-01
影响因子：
2.2
通讯作者：
Gschwind, R. M.
中科院分区：
文献类型：
--
作者：
Feldmeier, C.;Bartling, H.;Gschwind, R. M.
本文介绍了一种用于核磁共振光化学反应机理研究的LED照明装置。LED由NMR光谱仪在一级电子电路的帮助下直接切换。这允许LED的连续或交替脉冲操作。连续操作提供了与合成化学中的条件的直接可比性，在脉冲操作中，短时间光功率可以增强九倍。LED有效地耦合到1000 μ m芯光纤，通过简单地使其与光纤紧密接触而将光引导到光谱仪中。光纤的尖端通过喷砂而粗糙化，因此在接收器线圈的整个长度上以均匀和有效的方式发射光。这些技术的结合极大地增加了进入NMR样品的光量，使LED成为NMR样品原位照明的简单、通用和方便的光源，甚至允许单毫秒时间分辨的Photo-CIDNP光谱。(C)2013 Elsevier Inc. All rights reserved.
An LED based illumination device for mechanistic studies on photochemical reactions by means of NMR spectroscopy is presented. The LEDs are directly switched by the NMR spectrometer with the help of a one-stage electronic circuit. This allows for continuous or alternatively pulsed operation of the LEDs. Continuous operation provides direct comparability with conditions in synthetic chemistry, in pulsed operation the short time light power can be enhanced ninefold. The LEDs are efficiently coupled to a 1000 mu m core optical fiber guiding the light into the spectrometer by simply bringing it in close contact to the fiber. The tip of the fiber is roughened by sandblasting and thus emits light in a uniform and efficient way over the full length of the receiver coil. The combination of these techniques tremendously increases the amount of light brought into the NMR sample and makes LEDs an easy, versatile and handy light source for the in situ illumination of NMR samples allowing even for single millisecond time resolved Photo-CIDNP spectroscopy. (C) 2013 Elsevier Inc. All rights reserved.