Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

¹³C nuclear spin relaxation study of haloethynyltrimethylsilanes : Carbon-halogen interaction

Title data

Ejchart, Andrzej ; Gryff-Keller, Adam:
¹³C nuclear spin relaxation study of haloethynyltrimethylsilanes : Carbon-halogen interaction.
In: Journal of Magnetic Resonance A. Vol. 118 (February 1996) Issue 2 . - pp. 272-278.
ISSN 1064-1858
DOI: https://doi.org/10.1006/jmra.1996.0036

Abstract in another language

The longitudinal relaxation times and nuclear Overhauser enhancement factors for13C nuclei in three haloethynyltrimethylsilanes, (CH3)3SiCαtriple bond CβX, in CDCl3solution have been measured at four magnetic fields. The transverse relaxation times for acetylenic carbons have been also determined. Contributions to the total relaxation rates due to various relaxation mechanisms have been separated. The dipolar mechanism dominates the relaxation of methyl carbons, whereas the relaxation due to the shielding anisotropy plays an important role in the case of acetylenic carbons. Finally, the relaxation of the Cβand to some extent the Cαcarbons is influenced by the scalar relaxation of the second kind. On the basis of these data, one-bond scalar coupling constants between quadrupole halogens and the Cβnuclei have been determined. Moreover, molecular motions of the investigated compounds have been described. Reorientation of the symmetry axis slows down with an increase of the mass of the substituent. An effort has been made to separate the overall diffusional rotation about the symmetry axis from the internal rotation of the methyl groups.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Biopolymers - Univ.-Prof. Dr. Paul Rösch
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Biopolymers
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
500 Science > 570 Life sciences, biology
Date Deposited: 11 Jan 2019 07:47
Last Modified: 16 May 2019 05:37
URI: https://eref.uni-bayreuth.de/id/eprint/46878