Magnetic Interactions Influencing Spectral Analysis and Quantitation in Nuclear Magnetic Resonance Spectroscopy
Year: 2019
Type: dissertation
Abstract: There are many chemical analytical techniques available to probe molecular structures. Nuclear Magnetic Resonance (NMR) spectroscopy is an analytical spectroscopy technique that exploits strong external magnetic field and is capable of elucidating and quantifying molecular structures at the atomic level. NMR spectrum is typically measured from dissolved materials or directly from solid materials. The influence of magnetic interactions in solution and solid-state define the information that is obtainable from the NMR spectrum. The molecular motion and mobility play a key role. The obtainable spectral resolution in solid-state is usually lower than in the liquid state due to the presence of anisotropic interactions, which are not averaged out like in solution state. In NMR this means that the spectra, which contain the structural information, can be visually very different. These phenomena, combined with the need to obtain quantitative information, need to be addressed with proper considerations when acquiring and interpreting NMR data. This thesis focuses on the impact of relevant magnetic interactions in NMR via selected chemical structure studies of materials such as lignin, Ziegler-Natta (ZN) and aluminosilicate catalysts and cellulose.
Source: Työväentutkimus Vuosikirja
Author: Heikkinen, Harri
Institutions: University of Helsinki, University of Jyväskylä
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2980140765