Chapter 12 Notes

Chapter 12 Notes - Chapter12:IdentifyingOrganicCompounds...

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Chapter 12: Identifying Organic Compounds Mass Spectrometry ­ Infrared Spectroscopy ­ Nuclear Magnetic Resonance Spectroscopy (NMR) ­ Mass Spec: 1. Sample is vaporized into the spectrometer 2. Sample is bombarded by high energy electrons Results: Title: Jul 27 ­ 11:07 AM (1 of 11)
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Title: Nov 15 ­ 4:22 PM (2 of 11)
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Z usually equals 1, so the peaks correspond to mass (m) Mass Spectrum: Base Peak = Parent Peak / Molecular Ion ( ) = Mass Spectrum of Methane: Title: Jul 28 ­ 9:53 AM (3 of 11)
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Mass Spectrum of Methane and Propane Title: Nov 15 ­ 4:22 PM (1 of 10)
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How to use a mass spectrum: M + Peak = Molecular Weight How can the following compounds be distinguished from one another using mass spec? Propane Propene Propyne MW = Distinguish between compounds with the same nominal mass M+1 peak indicates the presence of isotopically substituted compounds Sometimes a M + peak is not present Title: Jul 28 ­ 10:02 AM (2 of 10)
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Interperating Fragmentation Patterns: Fragmentation occurs when the high­energy cation undergoes a spontaneous bond cleavage Example: 2,2­Dimethylpropane Title: Jul 28 ­ 10:08 AM (3 of 10)
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Figure 12.3 ­ Mass Spectrum of 2,2­Dimethylpropane Title: Nov 15 ­ 4:26 PM (4 of 10)
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Spectrum of Hexane Title: Nov 15 ­ 4:30 PM (5 of 10)
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Chapter 12 Notes - Chapter12:IdentifyingOrganicCompounds...

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