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| Portion of IR between 600 and 1400, where many complex vibrations occurs; so named because no 2 compounds have exactly the same absorptions in this region |
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| vibration that changes the dipole moment of the molecule and thus can absorb infrared light. |
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| double bonds that alternate between single bonds, so their pi bonding orbitals can overlap with each other |
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| A positively charged ion with an unpaired electron; commonly formed by electron impact ionization, when the impinging electron knocks out an additional electron |
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| Strongest peak in the mass spectrum |
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| Molecular ion/ M+(Parent ion) |
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| In mass spectroscopy, the ion with the same molecular weight of the original compound; no fragmentation has occurred |
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1660
Aromatic: 1600
Isolated:1640-1680
Conjugated: 1620-1640 |
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| M+2 larger than usual (4% of M+) |
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