Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

How many geometric isomers of the complex ion [Cr(dmen)3]3+ can exist? (dmen is the bidentate ligand 1,1-dimethylethylenediamine.)


1,1-Dimethylethylenediamine, dmen

Interpretation Introduction

Interpretation: The geometric isomers of the given complex have to be predicted.

Concept introduction:

Isomerism: Isomers are compounds with same molecular formula with different arrangements of atoms.

  • Structural isomers: Have same molecular formula but different bonding arrangements of atoms. It is classified into coordination isomer (occurs by exchanging a coordinated ligand and the counter-ions) and linkage isomers (ligand attached through different atoms to the metal).
  • Stereoisomers: differ in their spatial arrangement of atoms.
  • There are different types of isomerism in which geometric is of one type where the rotation around the atom is restricted like in cis-trans configuration. This is also refereed as cis-trans isomerism.

The fac[Cr(dmen)3]3+ geometric isomer of the given complex [Cr(dmen)3]3+ is shown below, in which the red colored nitrogen placed in facial position gives rise to one of the geometric isomer called facial-isomer.

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