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3. The Chemical Environment
About this Lecture
In the third mini-lecture, we learn about the chemical environment, and what it means for a nucleus to be in a unique chemical environment. We learn that the number of unique chemical environments corresponds to the number of signals we see on an NMR spectrum. Additionally, we learn that symmetry within a molecule can affect the number of unique environments (both 1H and 13C) by looking at 4-ethylphenol.
In this course, Dr Danny Allwood (Sheffield Hallam University) introduces the concept of NMR spectroscopy, a ubiquitous analytical tool used in all fields of chemistry to determine the structure of compounds. We start by: (i) investigating two types of NMR based on certain nuclei, 1H and 13C, and the sorts of information we can gather from NMR spectra of these nuclei; then (ii) learning about the different regions of a given NMR spectrum, understanding that certain environments and functional groups are likely to be found to be within a defined region of chemical space; (iii) and then beginning to understand why this happens; before (iv) moving onto the concept of integration, specifically with 1H spectra; and then (v) understanding how nuclei in adjacent environments affect each other’s peaks on a spectrum by a process known as coupling; before finally (vi) showing the NMR spectra of isomers, and realising their differences and understanding why this happens.
Dr Danny Allwood joined Sheffield Hallam University from the University of Cambridge, where he undertook a PhD (2008-2012) and post-doctoral research (2012-2015) with Professor Steven V. Ley CBE FRS. Prior to this, he attained my undergraduate degree at the University of Warwick (2004-2008). His current research programme is focused on the development of practical synthetic and catalytic organic transformations.
Cite this Lecture
Allwood, D. (2022, January 12). NMR Spectroscopy - The Chemical Environment [Video]. MASSOLIT. https://massolit.io/courses/nmr-spectroscopy/the-chemical-environment
Allwood, Danny. "NMR Spectroscopy – The Chemical Environment." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022, https://massolit.io/courses/nmr-spectroscopy/the-chemical-environment