Selective NMR measurements of homonuclear scalar couplings in isotopically enriched solids
Article Abstract:
The combined selective double-quantum (DQ)-filter and z-filtered experiment has allowed Ihomonuclear scalar (J) couplings as small as 8 Hz to be selectively measured in fully and partially enriched multispin systems. The measured couplings provide strong additional structural constraints for these materials and for those materials that cannot be characterized by diffusion or diffraction methods as they lack long-range order and for which solid-state NMR is the only method that provides molecular-level information.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Solution-state NMR studies of the surface structure and dynamics of semiconductor nanocrystals
Article Abstract:
A study was conducted to analyze the surface structure and properties of thiophenol-capped CdS nanocrystals using 1H and 13C nuclear magnetic resonance relaxation. The transverse and longitudinal relaxation times were examined as a function of nanocrystal radius. Results indicated the existence of a single type of thiophenol on the nanocrystal surface. Findings also showed that the anomalous temperature dependence of transverse relaxation supported an additional mechanism.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Assignment and measurement of deuterium quadrupolar couplings in liquid crystals by deuterium-carbon NMR correlation spectroscopy
Article Abstract:
A study was conducted to determine the feasibility of using deuterium-carbon nuclear magnetic resonance correlation spectroscopy to measure the deuterium quadrupolar couplings in liquid crystals. A fully deuterated nematic 4-n-pentyl-4'-cyanobiphenyl was used since it is a well-characterized model of thermotropic liquid crystal. Results indicated that the method is effective since it can overcome overlap problems.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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