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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Acetylacetone, abbreviated acacH, is a bidentate ligand. It loses a proton and coordinates as acac, as shown below, where M is a transition metal:

Chapter 21, Problem 47E, Acetylacetone, abbreviated acacH, is a bidentate ligand. It loses a proton and coordinates as acac,

Which of the following complexes are optically active: cis-Cr(acac)2(H2O)2, trans-Cr(acac)2(H2O)2, and Cr(acac)3?

Interpretation Introduction

Interpretation: The optically active compound between cisCr(acac)2(H2O)2 , transCr(acac)2(H2O)2 and Cr(acac)3 is to be identified.

Concept introduction: The following are the conditions for the optically active compounds,

  • The compound should not have plane symmetry.
  • The compound should not have center of symmetry.
  • The mirror image of the compound should be non-superimposable.

If plane passes through the molecule and the molecule is divided into two equal halves, then the molecule is said to have plane symmetry. Normally, trans complex compounds show plane of symmetry.

A point is said to be the center of symmetry, if same molecules are present in the opposite direction to each other.

A molecule is said to be non-superimposable, if its mirror image does not overlap each other completely.

To determine: The optically active compound between cisCr(acac)2(H2O)2 , transCr(acac)2(H2O)2 and Cr(acac)3 .

Explanation

Explanation

The structure of the compound cisCr(acac)2(H2O)2 is,

Figure 1

The structure of ligand acac is,

Figure 2

No plane can divide the above stated compound into two equal halves. Hence, the compound cisCr(acac)2(H2O)2 does not have plane symmetry.

Since, no point exists in the structure of cisCr(acac)2(H2O)2 where same molecules are present in the opposite directions to each other; therefore, this compound does not have center of symmetry.

The mirror image of cisCr(acac)2(H2O)2 is,

Figure 3

It is clear from the figure that, the mirror image of cisCr(acac)2(H2O)2 is non-superimposable.

Hence, the compound cisCr(acac)2(H2O)2 is optically active because it satisfies all the conditions

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