Review 1 - C h a p s 1 2 -1 4 R e v ie w 2 1 . IR B a s ic...

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Chaps 12-14 Review
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1. IR Basic Concepts • IR Stetching and Bending • IR Spectra 2
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2. Typical Stretching Frequencies 3 O-H & N-H str at 3600-3200 cm -1 –C = C- str at 2200 cm -1 (weak or absent if internal)
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4
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5
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3. An IR Spectrum 6
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4. IR Problems 7
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4. IR Problems 8
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5. Mass Spectrometry: Basic concepts • Basic principles • Fragmentation patterns 9
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Radical cations • A beam of high-energy electrons breaks the molecule apart. A radical cation forms first, which then fragments 10 + Molecular ion (a radical cation) + R' + + + Cation Radical Radical Cation R R' R R R
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11 A Mass Spectrum • Masses are graphed or tabulated according to their relative abundance.
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Molecular ion - The ion obtained by the loss of one electron from the molecule (m + ) Base peak - The most intense peak in the MS, assigned 100% intensity Radical cation - positively charged species with an odd number of electrons Fragment ions - Lighter cations (and radical cations) formed by the decomposition of the molecular ion. These often correspond to
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Review 1 - C h a p s 1 2 -1 4 R e v ie w 2 1 . IR B a s ic...

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