Ch_322a_9.015

Ch_322a_9.015 - Proton Splittings: Decoupling Strategies 13...

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Proton Splittings: Decoupling Strategies 13 C- 13 C Coupling Spin-spin interaction between two 13 C is not generally observed because of the low natural abundance of this minor isotope (1.1%). It is very unlikely that two of these "nmr active" nuclei will be close enough in a structure to spin-spin couple. 13 C- 1 H Coupling Spin-spin interactions between 13 C and 1 H are observed and may complicate the cmr spectrum. Typical J values for 13 C- 1 H ! are 100-320 Hz . Long range splittings due to 13 C- 1 H " and even 13 C- 1 H # are also significant. CMR spectra often show complex and overlapping multiplets that may be difficult to interpret.
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Unwanted splittings by 1 H are eliminated by decoupling the hydrogen nucleus using a technique called double resonance . The energy splittings for the spin states of two coupled nuclei A and B in the presence of B o are shown below. ! E
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_9.015 - Proton Splittings: Decoupling Strategies 13...

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