Purple Benzene

CCA! Volume 5

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Purple Benzene

Crown ether 18-dibenzo-crown-6 is added to solid potassium permanganate in benzene.


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Voiceover
Solid potassium permanganate is added to benzene. The ionic solid does not dissolve in the nonpolar organic liquid. When the crown ether 18-dibenzo-crown-6 is added, the potassium permanganate dissolves forming a purple solution. The crown ether forms a host-guest complex with potassium ion, and the resulting complex is soluble in benzene.

Discussion
Crown ethers were discovered by Charles Peterson who shared the Nobel Prize in Chemistry in 1987 with J. M. Lehn and Donald Cram for developments in the field of host-guest complexes.

...with the MNO₄^- soluble in benzene

Molecular model of 18-dibenzo-crown-6

Design, Text and Demonstrator:
	Gary Trammell	University of Illinois at Springfield, Springfield, IL 62794

Videographer/Editor:
	Steve Dykema	University of Illinois at Springfield, Springfield, IL 62794

Voice:
	Margaret Biddle	University of Wisconsin - Madison, Madison, WI 53706

Audio Production:
	Greg Minix	University of Wisconsin - Madison, College of Engineering, Madison, WI 53706
	Jerrold J. Jacobsen	University of Wisconsin - Madison, Madison, WI 53706