Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 110, Issue 1, Pages 8-12Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2005.01.007
Keywords
sensing; hydrazines; fluorescence; hydrogen bonding; cyclophane; carbazole
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A carbazolopyridinophane has been designed and prepared, with an internal N-H center dot center dot center dot N hydrogen bond between the carbazole and pyridine rings. This hydrogen bond causes the fluorescence of the carbazole unit to be substantially quenched. In heptane solution, addition of ammonia or simple hydrazines disrupts the internal hydrogen bond and restores fluorescence, within 1-5 min. Signal intensity varies linearly with guest concentration; concentrations of ammonia or hydrazines down to 100 ppb have been measured. (C) 2005 Elsevier B.V. All rights reserved.
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