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Displacement of the Benzene Solvent Molecule from Cr(CO)5(benzene) by Piperidine: A Laser Flash Photolysis Experiment

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Ashfaq A. Bengali and Samantha B. Charlton

Department of Chemistry, Dickinson College, Carlisle, PA 17013

J. Chem. Educ., 2000, 77 (10), p 1348

DOI: 10.1021/ed077p1348

Publication Date (Web): October 1, 2000

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Feature):

Advanced Chemistry Classroom and Laboratory

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Kinetics

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Displacement of the Benzene Solvent Molecule from Cr(CO)5(benzene) by Piperidine: A Laser Flash Photolysis Experiment