Luminol

=Oxidation of Luminol= By Maddy and Kira

VIDEO OF THE OXIDATION OF LUMINOL
 Boudreaux, Kevin A. Anglo State University: Chemistry. Luminol: A Glow in the Dark Reaction. http://www.angelo.edu/faculty/kboudrea/demos/luminol/luminol.htm. (Accessed 1 February 2010)
 * [|REAL]**

Abstract
The purpose of this experiment was to observe the effect of food coloring on altering the hue of the blue glow produced during the oxidation of luminol. Three colors of regular and three colors of neon food coloring dye were added to a hydrogen peroxide solution before it was combined with an aqueous solution containing luminol, and the following effect of the dyes in altering the color of the resulting glow was measured, photographed and recorded. Because fluorescent dyes in glow sticks (which also use the oxidation of luminol to produce light) give color to the glow produced when their electrons are excited by the released energy and then fall back to stable levels releasing specific colors of light, the experiment tested if all dyes had that effect. It was found that neon dyes produced more of a difference than regular dyes, but that overall they darkened the glow and had a small influence on the color. This finding lead to the conflusion that food coloring dyes and fluorescent dyes have different chemical properties and that food coloring dyes do not function the same way altering the glow of the oxidation of luminol. Keywords: luminol, chemiluminescence, fluroescent dye, oxidation reaction.

RESULTS
|| -Glowed slightly teal -Was slightly darker than the control || -Glowed dark teal -Barely glowed || -Glowed slightly purple -Glowed slightly || -Pinkish-purple -Barely glowed || -Dark purple -Glowed the least || -Glowed more teal than the yellow dye’s teal -Didn’t glow quite as brightly as the yellow ||
 * ** Control ** || ** Yellow Dye ** || ** Green Dye ** || ** Red Dye ** || ** Neon Red Dye ** || ** Neon Purple Dye ** || ** Neon Green Dye ** ||
 * Glowed bright light blue

LAB PHOTOS
Control

(green, red, yellow, neon green, neon red, neon purple)


 In this experiment soldium tetrachloroaurate (NaAuCl4) and luminol were combined in aqueous solutions to create gold nanoparticles. A chemiluminscence monitor was used to observe the formation of the nanoparticles because it was able to measure the light scattering and get a more accurate reading of the molecular location and bonding than a UV monitor because some particles absorb more UV energy than others. The gold nanoparticles were synthesized by removing portions of the aqueous solution at set time intervals and putting them through the spectroscope. A blue light was emitted instantly when the luminol and sodium tetrachloroaurate came in contact which was assumed to be the oxidation of the luminol in the aqueous solution. It was found that the gold nanoparticles began forming immediately as particles scattered when the light wavelength reached 470 nm. From this evidence it was concluded that the formation of the gold nanoparticles are due to the autoreduction of the luminol-sodium tetrachloroaurate solution. The reduction of the remaining sodium tetrachloroaurate lead to the growth of gold nanoparticles, which formed gold nuclei. The remaining luminol then served as a capping agent to cap the surface of the gold molecules, which was lead to a controlled growth of molecules. Researchers were surprised to learn that gold served as a reductive and protecting reagent and anticipate further research. From: Lv, Baoqiang. Su, Xiaodong. Li, Yang. Yi, Li. Mao, Jainfei. Xiao, Dan. 27 November. Fabrication of Gold Nanoparticles Using Luminol as a Reductive and Protective Reagent. Inorganic Materials. Vol 44 No. 8. 813-817.