Chiral Crystallization. The optical rotation of a large single crystal (28 mm x 24 mm x 5.0 mm) of levorotatory ethylenediamine sulphate is displayed by viewing polarized white light transmitted by the crystal through a Polaroid sheet. The photographs from left to right and top to bottom show a clockwise rotation of the top Polaroid sheet in increments of 30°. Similar experiments with quartz crystals led Jean Baptiste Biot to the discovery of optical rotation. See the article "Chiral Crystallization of Ethylenediamine Sulfate" by Lawrence Koby, Jyothi B. Ningappa, Maria Dakessian, Louis A. Cuccia.
The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students.
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