Use of an internal reference in 13C chemical shift measurements

The use of the nominal value of the chemical shift of the solvent to calibrate the spectrometer in 13C NMR spectroscopy was found to introduce errors due to the effect which the solute has on the solvent. In addition, hexamethyldisiloxane (HM) is proposed as an internal standard; owing to its high b...

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Detalles Bibliográficos
Autores principales:	de Kowalewski, D.G., de Los Santos, C., Marceca, E.
Formato:	JOUR
Materias:	13C chemical shift measurement Internal reference
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_07491581_v28_n1_p1_deKowalewski
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_07491581_v28_n1_p1_deKowalewski
record_format	dspace
spelling	todo:paper_07491581_v28_n1_p1_deKowalewski2023-10-03T15:39:19Z Use of an internal reference in 13C chemical shift measurements de Kowalewski, D.G. de Los Santos, C. Marceca, E. 13C chemical shift measurement Internal reference The use of the nominal value of the chemical shift of the solvent to calibrate the spectrometer in 13C NMR spectroscopy was found to introduce errors due to the effect which the solute has on the solvent. In addition, hexamethyldisiloxane (HM) is proposed as an internal standard; owing to its high boiling point it is easier to manipulate than tetramethylsilane (TMS) and it is therefore possible to prepare solutions of known concentrations. In order to convert the data obtained with this standard to the TMS scale, the chemical shift of HM was determined in 16 solvents using cyclohexane as external standard in a spherical cell (5% w/w concentration of HM) as a function of the solvent factor g2. Comparing these results with a similar plot obtained previously for TMS by other workers, it is possible to convert one type of data to the other by a simple linear expression. Copyright © 1990 John Wiley & Sons, Ltd. Fil:Marceca, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07491581_v28_n1_p1_deKowalewski
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	13C chemical shift measurement Internal reference
spellingShingle	13C chemical shift measurement Internal reference de Kowalewski, D.G. de Los Santos, C. Marceca, E. Use of an internal reference in 13C chemical shift measurements
topic_facet	13C chemical shift measurement Internal reference
description	The use of the nominal value of the chemical shift of the solvent to calibrate the spectrometer in 13C NMR spectroscopy was found to introduce errors due to the effect which the solute has on the solvent. In addition, hexamethyldisiloxane (HM) is proposed as an internal standard; owing to its high boiling point it is easier to manipulate than tetramethylsilane (TMS) and it is therefore possible to prepare solutions of known concentrations. In order to convert the data obtained with this standard to the TMS scale, the chemical shift of HM was determined in 16 solvents using cyclohexane as external standard in a spherical cell (5% w/w concentration of HM) as a function of the solvent factor g2. Comparing these results with a similar plot obtained previously for TMS by other workers, it is possible to convert one type of data to the other by a simple linear expression. Copyright © 1990 John Wiley & Sons, Ltd.
format	JOUR
author	de Kowalewski, D.G. de Los Santos, C. Marceca, E.
author_facet	de Kowalewski, D.G. de Los Santos, C. Marceca, E.
author_sort	de Kowalewski, D.G.
title	Use of an internal reference in 13C chemical shift measurements
title_short	Use of an internal reference in 13C chemical shift measurements
title_full	Use of an internal reference in 13C chemical shift measurements
title_fullStr	Use of an internal reference in 13C chemical shift measurements
title_full_unstemmed	Use of an internal reference in 13C chemical shift measurements
title_sort	use of an internal reference in 13c chemical shift measurements
url	http://hdl.handle.net/20.500.12110/paper_07491581_v28_n1_p1_deKowalewski
work_keys_str_mv	AT dekowalewskidg useofaninternalreferencein13cchemicalshiftmeasurements AT delossantosc useofaninternalreferencein13cchemicalshiftmeasurements AT marcecae useofaninternalreferencein13cchemicalshiftmeasurements
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Use of an internal reference in 13C chemical shift measurements

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