Chen, Jocelyn S. Y., Euser, Tijmen G., Farrer, Nicola J., Sadler, P. J., Scharrer, Michael and Russell, Philip St. J.. (2010) Photochemistry in photonic crystal fiber nanoreactors. Chemistry - A European Journal, Vol.16 (No.19). pp. 5607-5612. ISSN 0947-6539

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Abstract

We report the use of 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 (2.8 nL 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 Bp, cyanocobalamin (CNCbl) to hydroxocobalamin ([H(2)OCbl](+)) 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.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QP Physiology
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Photochemistry, Hydrolysis, Vitamin B12, Photonic crystals
Journal or Publication Title:	Chemistry - A European Journal
Publisher:	Wiley - V C H Verlag GmbH & Co. KGaA
ISSN:	0947-6539
Date:	17 May 2010
Volume:	Vol.16
Number:	No.19
Number of Pages:	6
Page Range:	pp. 5607-5612
Identification Number:	10.1002/chem.201000496
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Körber-Stiftung, Friedrich-Alexander-Universität Erlangen-Nürnberg, Engineering and Physical Sciences Research Council (EPSRC), Medical Research Council (Great Britain) (MRC)
Grant number:	EP/G006792/1 (EPSRC), EP/F034210/1 (EPSRC), G0701062 (MRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/5786

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