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[Organic Chem] NMR Spectroscopy

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Chapter 15 NMR Spectroscopy Paula Yurkanis Bruice University of California, Santa Barbara © 2014 Pearson Education, Inc. Nuclear Magnetic Resonance (NMR) Spectroscopy NMR spectroscopy identifies the carbon–hydrogen framework of an organic compound. Certain nuclei, such as 1H, 13C, 15N, 19F, and 31P, have a nonzero value for their spin quantum number; this property allows them to be studied by NMR. © 2014 Pearson Education, Inc. The Spin State of a Nucleus is Affected by an Applied Magnetic Field © 2014 Pearson Education, Inc. The ∆ Energy Between the Two Spin States Depends on the Strength of the Applied Magnetic Field (Bo) © 2014 Pearson Education, Inc. The Operating Frequency of the Spectrometer Depends on the Strength of the Magnetic Field © 2014 Pearson Education, Inc. All the Hydrogens in a Compound Do Not Experience the Same Magnetic Field The electrons surrounding the nucleus decrease the effective applied magnetic field sensed by the nucleus. © 2014 Pearson Education, Inc. Where Protons Show a Signal © 2014 Pearson Education, Inc. Chemically Equivalent Protons (protons in the same environment) © 2014 Pearson Education, Inc. How Many Signals? Each set of chemically equivalent protons give a signal in the 1H NMR spectrum. © 2014 Pearson Education, Inc. How Many Signals? © 2014 Pearson Education, Inc. How Many Signals? © 2014 Pearson Education, Inc. The Reference Compound TMS is the reference compound (it appears at = ...
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