Studying a ligand substitution reaction with variable temperature 1H NMR spectroscopy

The study of ligand substitution reactions of transition metal complexes is often a significant component of undergraduate courses in inorganic chemistry. In the laboratory, many undergraduates have studied the aquation of [Co(NH3)5Cl]2+at elevated temperatures, taking aliquots of the reaction mixtu...

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Published in:Journal of chemical education 2003-07, Vol.80 (7), p.803
Main Authors: Orvis, Jeffery A, Dimetry, Basant, Winge, Jeffrey, T Corbin Mullis
Format: Article
Language:English
Subjects:
Ammonia
Chemistry
Coordination compounds
High temperature
Ligands
Metal complexes
NMR
NMR spectroscopy
Nuclear magnetic resonance
Organic chemistry
Reaction mechanisms
Spectroscopy
Substitution reactions
Temperature
Transition metal compounds
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creator Orvis, Jeffery A
Dimetry, Basant
Winge, Jeffrey
T Corbin Mullis
description The study of ligand substitution reactions of transition metal complexes is often a significant component of undergraduate courses in inorganic chemistry. In the laboratory, many undergraduates have studied the aquation of [Co(NH3)5Cl]2+at elevated temperatures, taking aliquots of the reaction mixture, and obtaining a series of UV-vis spectra. Recently, an improved synthesis of a similar complex, trans-[Co(NH3)4Cl2]+ was reported. This complex undergoes aquation in less than an hour at room temperature, much faster than [Co(NH3)5Cl]2+, and is readily monitored by 1H NMR spectroscopy. This reaction forms the basis of an instructive, multi-week laboratory experience in inorganic synthesis, followed by an analysis of a reaction mechanism using a classical activation parameter determination.
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Ammonia
Chemistry
Coordination compounds
High temperature
Ligands
Metal complexes
NMR
NMR spectroscopy
Nuclear magnetic resonance
Organic chemistry
Reaction mechanisms
Spectroscopy
Substitution reactions
Temperature
Transition metal compounds
title Studying a ligand substitution reaction with variable temperature 1H NMR spectroscopy
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