Repeatable Chemiluminescence from Luminol without Added Hydrogen Peroxide

Le résumé fourni par la source

High Resolution Image Download MS PowerPoint Slide Chemiluminescence is the emission of light that results from a chemical reaction, in which part of the energy produced is converted into light energy. These reactions can be difficult to visualize and control. In this article, we describe an experimental approach for demonstrating chemiluminescence to students and researchers. The main purpose of this study is to trigger chemical thinking skills and the spirit of inquiry in students by exploring the roles of oxidants and reaction mechanisms in luminol oxidation reactions. Chemiluminescence was observed when a drop of an ethanol solution containing potassium hydroxide was added into a luminol solution in dimethyl sulfoxide followed by shaking. Using dissolved oxygen as an oxidant, the experimental solution glowed upon shaking and gradually faded when left to stand, allowing repeated observation of chemiluminescence. The experimental demonstration of the proposed luminol oxidation reaction in the classroom helped students to directly experience chemiluminescence and deepen their interest in photochemistry. This exploratory activity of oxidants promoted independent learning among the students. The experimental approach presented in this study is of educational value and can be tailored according to the learning situation and level of understanding of the audience.

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