JCE Online Journal of Chemical Education
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 

JCE Print
   Current Issue
 Previous Issues
 Supplements
 Search JCE Index

JCE Digital Library
   DigiDemos
 QBank
 SymMath
 WebWare

JCE Software
   Latest Releases
 Software & Video
 Downloads
 Support

Only@JCE Online
   JCE Online Store
 JCE HS CLIC
 JCE Discussion Forums
   Biographical Snapshots
 ChemEd Resource Shelf
 Featured Molecules
 Hal's Picks
 Project Chemlab
 Reviewed WWW Sites
 "Web-Ed" Articles

About JCE
   Features
 Publications
 Operations
 Outreach
 Contact Us


  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > November  >
In the Laboratory
Cotton Effect in Copper–Proline Complexes in the Visible Region
Victor Volkov and Rolf Pfister
Physical Chemistry Institute, University Zuerich, 8057 Zurich, Switzerland
Cover
November 2005
Vol. 82 No. 11
p. 1663
Abstract
Optical rotatory dispersion (ORD) is an effective and relatively inexpensive method for probing both molecular structural and electronic properties. A typical ORD experimental setup in a student laboratory course utilizes the spectrally broad output of a tungsten lamp. Unfortunately its spectral output does not overlap with most of the electronic resonances in common molecular systems in a chemistry lab. Therefore it is difficult to demonstrate to students a representative Cotton effect. In this article we suggest taking advantage of the visible d–d electronic transition of Cu2+. This allows us to contrast the normal ORD response of d- and l-proline in aqueous solution with the strong Cotton effect observed when these amino acids are complexed with a metal cation. This experiment covers a number of topics in organic and inorganic chemistry and in optical spectroscopy. We provide the details of the complex preparation and discuss the instrumental basics for the ORD data measurements. This experiment is suitable for a second-year undergraduate laboratory course in physical chemistry.
Supplement
Timetable for the experiment, preparation and instrumental analysis of the complexes, and details on the home-built ORD spectrometer are available.
*  Contents JCE2005p1663W.doc (Microsoft Word)
*  Download
JCE2005p1663W.pdf

JCE2005p1663W.zip
More Information
*  Citation
 Volkov, Victor; Pfister, Rolf. J. Chem. Educ. 2005 82 1663.
*  Keywords
 Amino Acids; Chirality / Optical Activity; Coordination Compounds; Crystal Field / Ligand Field Theory; Hands-On Learning / Manipulatives; IR Spectroscopy; Laboratory Instruction; Molecular Properties / Structure; Organic Chemistry; Physical Chemistry; Second-Year Undergraduate; Spectroscopy; Stereochemistry; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 9/22/2005
9/29/2005
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > November  > Page 1663


Subscriptions
 Subscription Info
 Order Forms

JCE HS CLIC

Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
 JCE HS CLIC

Contributions Welcome
JCE welcomes your submission
 Contributors' Corner

Advertisers
In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first.
 Recent Advertisers

Be An Ambassador
Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants.
 Outreach with JCE

Comments to
jceonline@chem.wisc.edu		 Copyright © Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.