"Cool-Light" Chemiluminescence

Abstract

A commercially available chemiluminescent system is used to produce a yellowish-green cold light which is easily visible in a darkened room. The light, which is initially bright enough for reading, gradually fades over a period of about 12 hours. MaterialsThree CYALUME® (Trademark of American Cyanamid Company) lightsticks; may be obtained from the Ventron Corporation (Alfa Products), the Aldrich Chemical Company, or Markson Science Inc. In the Midwest, the lightsticks are also available in some hardware stores and gasoline filling stations.beaker, 500 ml (2) ice, 500 ml hot water, 400 ml Procedure To observe the chemiluminescence, follow the instructions on the package (bend the plastic tube slightly to break the thin vial inside, and shake). Since the light is generated without heat or flame, the "cool-light" source may be passed around the room to enable students to inspect it more closely.

Finale: Color in Foods, Photochemistry, Photoluminescence, Pharmaceuticals, Fireworks, Fun, and the Future

“…where hm represents the emitted photon of light of frequency m. Further details of this reaction can be found in [48]. Other chemiluminescent reactions have been Iron is an ideal catalyst, and since iron is contained in blood, forensic scientists use luminol as a sensitive test for the presence of blood at crime scenes.…”

Postulation of a Phenoxyl Radical Intermediate as the Species Responsible for the Background Emission Observed With Certain Peroxyoxalate Chemiluminescence Reagents

“…The reagents used in this study were: bis(2,4,6-trichlorophenyl) oxalate, (TCPO, 1) ( > 98% purity, Tokyo Kasei Kogyo, Japan), 2,4,6-trichlorophenol, (TCP), (97%, Fluka Chemie, Buchs, Switzerland), pentachlorophenol (PCP), (purified grade, Pierce, Rockford, IL, USA), 2,4-dichlorophenol (99%, Aldrich, Milwaukee, WI, USA), 2,6-dichlorophenol (99%, Tokyo Kasei Kogyo, Japan), bis(2,4-dichlorophenyl) oxalate ( 2), and bis(2,6dichlorophenyl) oxalate ( 3), (purity determined by 1 H n.m.r. as > 95%), were synthesised according to established methods.…”

“…as > 95%), were synthesised according to established methods. 14 The oxamides, 2,2A-oxalyl-bis[(trifluoromethanesulfonyl)imino]ethylene-bis(N-methylpyridinium) trifluoromethanesulfonate PETQ (4), and (4,4A-oxalyl-bis[(trifluoromethylsulfonyl)imino]ethylene-bis(1-methyl-1-benzylpiperidinium) trifluoromethanesulfonate, BPTQ ( 5), (purity determined by 1 H n.m.r. as > 95%), were prepared by a modification of the method reported by Mohan et al 13 The synthesis, purification and spectroscopic characterisation of oxamides 4 and 5 (together with other related CL compounds) will be published separately.…”

“…Whilst peroxyoxalate chemiluminescence (POCL) has found wide acceptance in the market place as a source of cold light, 1 it is even more useful in analytical chemistry where it has been applied to the determination of a variety of fluorescent species, either directly using flow analysis or after separation by liquid chromatography. [2][3][4] The mechanism of the reaction between suitably substituted diaryl oxalates and hydrogen peroxide is widely, but not universally, considered to generate dioxetane-1,2-dione (see Scheme 1) which may itself decompose to yield an as yet unidentified excited state species, possibly a carbon dioxide radical, (for a review of this mechanism, see ref.…”

Alternative Hydrogen Peroxide Sources for Peroxyoxalate “Glowstick” Chemiluminescence Demonstrations

“…[1][2][3][4][5][6][7] In a typical demonstration, a solution of a suitable oxalate diester and fluorescer in organic solvent is treated with aqueous hydrogen peroxide (depending on the identity of the oxalate diester, a base may also be added) to initiate chemiluminescence. The most frequently used oxalate diesters are bis(2,4,6-trichlorophenyl) oxalate (TCPO) and bis (2,4- …”