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Lecture

H- NMR vs Carbon 13 NMR.docx

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Department
Chemistry
Course
CHEM 2OA3
Professor
Jeff Landry
Semester
Fall

Description
Compare between H-NMR and C13-NMR H-NMR C13-NMR Chemical shift, integration, multiplicity Only chemical shift is important Singlet, duplet, triplet, etc (n+1 rule) Only singlet Have splitting of signals No splitting b/c of low abundance of C13 in nature Lower frequency (0-13ppm) C13 atoms resonate a larger frequency than H. (0-220ppm) Not subject to symmetry Subject to symmetry Factors affecting the shift: • Electronegativity of the groups attached to the C - Hybridization of C Requires FT-NMR Ot13r important things to note: • C has only about 1.1% natural abundance (of carbon atoms) • 12C does not exhibit NMR behaviour
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