English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  C-13 NMR of tunnelling methyl groups

Detken, A., Zimmermann, H., & Haeberlen, U. (1999). C-13 NMR of tunnelling methyl groups. Molecular Physics, 96(6), 927-940. doi:10.1080/002689799165035.

Item is

Basic

show hide
Genre: Journal Article
Alternative Title : C-13 NMR of tunnelling methyl groups

Files

show Files
hide Files
:
MolPhys_96_1999_927.pdf (Any fulltext), 905KB
 
File Permalink:
-
Name:
MolPhys_96_1999_927.pdf
Description:
-
OA-Status:
Visibility:
Restricted (Max Planck Institute for Medical Research, MHMF; )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show
hide
Description:
-
OA-Status:
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Detken, Andreas1, Author           
Zimmermann, Herbert2, 3, Author           
Haeberlen, Ulrich4, Author           
Affiliations:
1Emeritus Group Bioorganic Chemistry, Max Planck Institute for Medical Research, Max Planck Society, ou_1497711              
2Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              
3Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              
4Research Group Prof. Dr. Haeberlen, Max Planck Institute for Medical Research, Max Planck Society, ou_1497739              

Content

show
hide
Free keywords: -
 Abstract: The dipolar interactions between the protons and the central 13C nucleus of a 13CH3 group are used to study rotational tunnelling and incoherent dynamics of such groups in molecular solids. Single-crystal 13C NMR spectra are derived for arbitrary values of the tunnel frequency upsilon t. Similarities to ESR and 2H NMR are pointed out. The method is applied to three different materials. In the hydroquinone/acetonitrile clathrate, the unique features in the 13C NMR spectra which arise from tunnelling with a tunnel frequency that is much larger than the dipolar coupling between the methyl protons and the 13C nucleus are demonstrated, and the effects of incoherent dynamics are studied. The broadening of the 13C resonances is related to the width of the quasi-elastic line in neutron scattering. Selective magnetization transfer experiments for studying slow incoherent dynamics are proposed. For the strongly hindered methyl groups of L-alanine, an upper limit for upsilon is derived from the 13C NMR spectrum. In aspirinTM (acetylsalicylic acid), incoherent reorientations dominate the spectra down to the lowest temperatures studied; their rate apparently increases with decreasing temperature below 25K

Details

show
hide
Language(s): eng - English
 Dates: 1998-07-221998-09-232009-09-011999-03-20
 Publication Status: Issued
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Molecular Physics
  Other : Mol. Phys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Taylor & Francis
Pages: - Volume / Issue: 96 (6) Sequence Number: - Start / End Page: 927 - 940 Identifier: ISSN: 0026-8976
CoNE: https://pure.mpg.de/cone/journals/resource/954925264211