University of Illinois at Urbana-Champaign
Proton-coupled carbon-13 sample spinning NMR studies of macromolecules and ordered systems
Abstract
dc:description"We have studied a variety of macromolecular systems such as lipid/water lyotropic phases and elastomeric polymers, and in addition a thermotropic liquid-crystal displaying macroscopic orientational ordering behavior, by Carbon-13 ($\sp{13}$C) nuclear magnetic resonance (NMR) spectroscopy. We find that under ""magic angle"" spinning (MAS) these systems display high resolution due to extensive motions, and therefore traditional proton-decoupling is not necessary. In the absence of proton decoupling, i.e., proton-coupled MAS (PCMAS), we find that these systems display scalar hyperfine-coupled $\sp{13}$C splittings with radically asymmetric linewidths and shapes. We attribute these effects to cross-correlation terms between two or more different relaxation mechanisms, (dipolar/chemical shift anisotropy (DD/CSA) relaxations) at the high magnetic fields employed."
Degree
thesis:*- Name thesis:degree_name
- Ph.D.
- Level thesis:degree_level
- Dissertation
- Discipline thesis:degree_discipline
- Chemistry
- Grantor
- University of Illinois at Urbana-Champaign
- Year dc:date
- 2011
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Chung, John
- Contributors dc:contributor
-
- Oldfield, Eric
Subjects
dc:subject × 1Rights
dc:rights- Statement dc:rights
-
- Copyright 1991 Chung, John
- Language dc:language
- eng
Identifiers
dc:identifier.*- Identifier
-
AAI9210769
(UMI)AAI9210769 - OAI identifier oai:identifier
- oai:www.ideals.illinois.edu:2142/22541