Transcription of Lecture 3: Coupling Constants Chem 117 - GitHub Pages
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Lecture 3: Coupling Constants Chem 117 - GitHub Pages
Chem 117E. KwanLecture 3: Coupling ConstantsJanuary 31, ConstantsScope of LectureEugene E. Kwanenergy diagramsfor J couplingthe chemicalshiftHelpful References chemical Fermicontactmodelfirst- vs. second-order spectraHoye's methodwhat aretypicalcouplings?problemsolving1. Nuclear Magnetic Resonance Lambert, ; Mazzola, Prentice-Hall, 2004. (Chapter 3)2. The ABCs of FT-NMR Roberts, University Science Books, 2000. (Chapter 10)3. Spectrometric Identification of Organic Compounds (7th ed.) Silverstein, ; Webster, ; Kiemle, Wiley, 2005. (useful charts in the appendices of chapters 2-4)4. Organic Structural Spectroscopy Lambert, ; Shurvell, ; Lightner, ; Cooks, Prentice-Hall, Organic Structure Analysis Crews, P.
coupling J to 0, so that A and B don't interact. What's the energy level diagram for this system? Remember, and are short-hand notations for nuclei which are in the +1/2 and -1/2 states, respectively. By convention, the state is more stable than the state. If I write , then
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