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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > October  >
In the Laboratory
Advanced Chemistry Classroom and Laboratory
Displacement of the Benzene Solvent Molecule from Cr(CO)5(benzene) by Piperidine: A Laser Flash Photolysis Experiment
Ashfaq A. Bengali and Samantha B. Charlton
Department of Chemistry, Dickinson College, Carlisle, PA 17013
Cover
October 2000
Vol. 77 No. 10
p. 1348
Abstract
This laboratory experiment utilizes a nitrogen laser to investigate the chemistry of the Cr(CO)5(benzene) complex on the microsecond time scale. The unique capabilities of a laser and the chemistry made possible by its use is demonstrated. The Cr(CO)5(benzene) complex is formed by photolysis of Cr(CO)6 in benzene. The students investigate the rate and mechanism of the displacement of the solvent molecule from the chromium center by piperidine using the technique of laser flash photolysis. The role of the solvent in the reactions of coordinatively unsaturated organometallic molecules is emphasized. Studying this reaction at several temperatures allows the students to approximate the strength of the (CO)5Cr-benzene interaction.
Supplement
Student handouts and instructor notes are available as supplemental material.
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*  Citation
 Bengali, Ashfaq A.; Charlton, Samantha B. J. Chem. Educ. 2000 77 1348.
*  Keywords
 Kinetics; Lasers / Laser Spectroscopy; Organometallics; Photochemistry; Laboratory Instruction
*  History
 Created:
Last Updated:		 September 22, 2000
August 31, 2005
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