Studying a Ligand Substitution Reaction with Variable Temperature 1H NMR Spectroscopy: An Experiment for Undergraduate Inorganic Chemistry Students

Autor:	Jeffery A. Orvis, Basant Dimetry, T. Corbin Mullis, Jeffery T. Winge
Rok vydání:	2003
Předmět:	Substitution reaction Reaction mechanism Transition metal Ligand Chemistry Kinetics Inorganic chemistry Aquation Physical chemistry General Chemistry Spectral line Education Inorganic Syntheses
Zdroj:	Journal of Chemical Education. 80:803
ISSN:	1938-1328 0021-9584
DOI:	10.1021/ed080p803
Popis:	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.
Databáze:	OpenAIRE
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