Fluorescence-enhancement sensing of ammonia and hydrazines via disruption of the internal hydrogen bond in a carbazolopyridinophane

A carbazolopyridinophane has been designed and prepared, with an internal N H⋯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 disrupt...

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Published inSensors and actuators. B, Chemical Vol. 110; no. 1; pp. 8 - 12
Main Authors Brown, Alan B., Gibson, Tracy L., Baum, J. Clayton, Ren, Tong, Smith, Trent M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.09.2005
Subjects
Actuators
Ammonia
Carbazole
Carbazoles
Cyclophane
Fluorescence
Heptanes
Hydrazines
Hydrogen bonding
Hydrogen bonds
Quenching (cooling)
Sensing
Fluorescence
Hydrazines
Sensing
Cyclophane
Hydrogen bonding
Carbazole
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Summary:A carbazolopyridinophane has been designed and prepared, with an internal N H⋯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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2005.01.007