Zusammenfassung
Abstract 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 ...
Zusammenfassung
Abstract 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 nine-fold. The {LEDs} are efficiently coupled to a 1000 µm 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.
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