CHED 292 |
| Concomitant polymorphism refers to a process where two or more different forms (polymorphs) of a single compound crystallize out of the same solution. This is a rare occurrence as polymorphs typically form under different conditions, and thus concomitant polymorphism has been only reported for a small number of compounds. In our recent investigation into the photolysis of bis(9-anthryl)cyclopropenone (1) into bis(9-anthryl)acetylene, we serendipitously discovered that the product crystallizes as two distinct polymorphs from the same solution. One polymorph (2a), which is known, is essentially planar but in the other (2b) the two anthracene planes are twisted away from each other at an angle of about 67°. The synthesis, x-ray diffraction studies, and molecular orbital calculations of these polymorphic species are discussed.
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Undergraduate Research Poster Session
2:30 PM-4:30 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Chemical Education |
