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Chen J.S.Y.,Max Planck lnstitut fur Die Physik des Lichts | Euser T.G.,Max Planck lnstitut fur Die Physik des Lichts | Farrer N.J.,University of Warwick | Sadler P.J.,University of Warwick | And 2 more authors.
Chemistry - A European Journal | Year: 2010

We report the use ot a liquid-filled hollow-core photonic crystal fiber (PCF) as a highly controlled photochemical reactor. Hollow-core PCFs have several major advantages over conventional sample cells; the sample volume per optical path length is very small (2.8nL cm-1 in the fiber used), long optical path lengths are possible as a result of very low intrinsic waveguide loss, and furthermore the light travels in a diffractionless single mode with a constant transverse intensity profile. As a proof of principle, the (very low) quantum yield of the photochemical conversion of vitamin B 12, cyanocobalamin (CNCbI) to hydroxocobalamin ([H 2OCbl]+) in aqueous solution was measured for several pH values from 2.5 to 7.5. The dynamics of the actively induced reaction were monitored in real-time by broadband absorption spectroscopy. The PCF nanoreactor required ten thousand times less sample volume compared to conventional techniques. Furthermore, the enhanced sensitivity and optical pump intensity implied that even systems with very small quantum yields can be measured very quickly-in our experiments one thousand times faster than in a conventional cuvette. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.

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