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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > November  >
Chemical Education Today
Report
Cornell College Students Achieve the Highly Improbable
Addison Ault
Department of Chemistry, Cornell College, 600 First Street West, Mount Vernon, IA 52314-1098
Cover
November 2000
Vol. 77 No. 11
p. 1386
Abstract
On Tuesday, March 14, 2000, at Cornell College, Mount Vernon, Iowa, two students who prepared the photochromic compound 2-(2,4-dinitrobenzyl)pyridine obtained their product as a single crystal, one weighing 864 mg and the other 891 mg. As far as we know, this has happened only once before, also at Cornell College in Iowa. The web version of this paper includes a time-lapse video of the photochromic conversion in which the original brown-sugar brown crystals turn into the blue-jeans blue form under the influence of the photographer's floodlight.

See Letter re: this article.
Supplement
A revised procedure for carrying out this laboratory and the time-lapse video below of the photochromic crystals prepared using this method are available.

The video requires QuickTime 4 or higher. QuickTime can be downloaded here.

*  Contents JCE2000p1386W.doc (Microsoft Word)
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*  Citation
 Ault, Addison. J. Chem. Educ. 2000 77 1386.
*  Keywords
 Crystallography / Crystal Growth; Laboratory Instruction; Organic Chemistry; Organic Synthesis; Photochemistry
*  History
 Created:
Last Updated:		 October 6, 2000
August 31, 2005
Link to Letter added (April 2004).
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