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Why Are 1H NMR Integrations Not Perfect? An Inquiry-Based Exercise for Exploring the Relationship Between Spin Dynamics and NMR Integration in the Organic Lab
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Abstract
When FT-NMR is used to collect data without a sufficient delay time between subsequent pulses, the integrated area under certain peaks may result in a lower value than should be observed under appropriate conditions. This discrepancy in integration may deceive the inexperienced eye and consequently can lead to a wrong assignment of the NMR spectrum. The following exercise is designed to raise awareness of this issue in students and to serve as an inquiry-based stepping-stone into basic FT-NMR. The exercise can be conducted as part of an organic lab where the students are synthesizing a compound and analyzing its spectrum or as a theoretical exercise using the provided spectra.
Keywords (Audience):
Graduate Education / ResearchKeywords (Domain):
Laboratory InstructionKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
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This article has been cited by 1 ACS Journal articles (1 most recent appear below).
Synthesis of a Self-Healing Polymer Based on Reversible Diels–Alder Reaction: An Advanced Undergraduate Laboratory at the Interface of Organic Chemistry and Materials Science
Haim Weizman, Christian Nielsen, Or S. Weizman, and Sia Nemat-NasserJournal of Chemical Education2011 88 (8), 1137-1140Synthesis of a Self-Healing Polymer Based on Reversible Diels–Alder Reaction: An Advanced Undergraduate Laboratory at the Interface of Organic Chemistry and Materials Science
Haim Weizman, Christian Nielsen, Or S. Weizman, and Sia Nemat-NasserJournal of Chemical Education2011 88 (8), 1137-1140This laboratory experiment exposes students to the chemistry of self-healing polymers based on a Diels–Alder reaction. Students accomplish a multistep synthesis of a monomer building block and then polymerize it to form a cross-linked polymer. The healing ...
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- Received: August 03, 2009
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