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An Iodine Fluorescence Quenching Clock Reaction
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Abstract
A fluorescent clock reaction is described that is based on the principles of the Landolt iodine reaction but uses the potent fluorescence quenching properties of triiodide to abruptly extinguish the ultraviolet fluorescence of optical brighteners present in liquid laundry detergents. The reaction uses easily obtained household products. One variation illustrates the sequential steps and mechanisms of the reaction; other variations maximize the dramatic impact of the demonstration; and a variation that uses liquid detergent in the Briggs–Rauscher reaction yields a striking oscillating luminescence. The iodine fluorescence quenching clock reaction can be used in the classroom to explore not only the principles of redox chemistry and reaction kinetics, but also the photophysics of fluorescent pH probes and optical quenching.
Keywords (Audience):
Elementary / Middle School ScienceKeywords (Domain):
DemonstrationsKeywords (Feature):
JCE DigiDemos: Tested DemonstrationsKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Acids / BasesCiting Articles
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This article has been cited by 3 ACS Journal articles (3 most recent appear below).
A Microscale Approach to Chemical Kinetics in the General Chemistry Laboratory: The Potassium Iodide Hydrogen Peroxide Iodine-Clock Reaction
Prem D. SattsangiJournal of Chemical Education2011 88 (2), 184-188A Microscale Approach to Chemical Kinetics in the General Chemistry Laboratory: The Potassium Iodide Hydrogen Peroxide Iodine-Clock Reaction
Prem D. SattsangiJournal of Chemical Education2011 88 (2), 184-188A microscale laboratory for teaching chemical kinetics utilizing the iodine clock reaction is described. Plastic pipets, 3 mL volume, are used to store and deliver precise drops of reagents and the reaction is run in a 24 well plastic tray using a total ...
Clock Reaction: Outreach Attraction
Yuen-ying Carpenter and Heather A. Phillips, Michael B. JakubinekJournal of Chemical Education2010 87 (9), 945-947Clock Reaction: Outreach Attraction
Yuen-ying Carpenter and Heather A. Phillips, Michael B. JakubinekJournal of Chemical Education2010 87 (9), 945-947Chemistry students are often introduced to the concept of reaction rates through demonstrations or laboratory activities involving the well-known iodine clock reaction. For example, a laboratory experiment involving thiosulfate as an iodine scavenger is ...
Classroom Activity Connections: Lessons from Fluorescence
Aoife MacCormac, Emma O’Brien and Richard O’KennedyJournal of Chemical Education2010 87 (7), 685-686Classroom Activity Connections: Lessons from Fluorescence
Aoife MacCormac, Emma O’Brien and Richard O’KennedyJournal of Chemical Education2010 87 (7), 685-686This Classroom Activity Connections paper describes an extension to the JCE Classroom Activity #68 “Turning on the Light”. A number of additional common items that display fluorescence under UV light are described, including fruits, vegetables, and ...
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- Received: August 03, 2009
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