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Cotton Effect in Copper-Proline Complexes in the Visible Region

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Victor Volkov and Rolf Pfister

Physical Chemistry Institute, University Zuerich, 8057 Zurich, Switzerland

J. Chem. Educ., 2005, 82 (11), p 1663

DOI: 10.1021/ed082p1663

Publication Date (Web): November 1, 2005

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Chirality / Optical Activity

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Modern Developments in the Physical Chemistry Laboratory
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  2007 973 (), 115-151
  Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
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