INFRARED (IR) SPECTROSCOPY. IR Spectroscopy – The Spectrum.
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Transcript of INFRARED (IR) SPECTROSCOPY. IR Spectroscopy – The Spectrum.
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INFRARED (IR) SPECTROSCOPY
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IR Spectroscopy – The Spectrum
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IR Spectroscopy – The Spectrum
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IR Spectroscopy
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h
IR Spectroscopy - Theory
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Energy is proportional to the frequency n of the vibration
Frequency is related to the force constant (K) and the Reduced mass (
En = (n + ½)h, n = 0, 1, 2, 3,….
IR – Bond Properties and Absorption Trends
The molecule may possess only quantized amounts of energy.
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IR – Bond Properties and Absorption Trends
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IR – Modes of Stretching and Bending
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IR – Correlation Chart
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IR – Pentane; neat vs gas phase vs CCl4 solution
neat
CCl4 solution
Gas phase
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IR – Alkyl Halides
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IR – Alkenes
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IR – Alkenes: Out Of Plane bending (the oop region)
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IR – Alkynes
1-heptyne
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IR – Aromatics
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IR – Aromatics; Substitution Pattern
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IR – Alkenes: Out Of Plane bending (the oop region)
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IR – Alcohols and Phenols
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IR – Alcohols; 1o vs 2o vs 3o
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IR – Unknown (C6H14 O)
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IR – Ethers
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IR – Carbonyl compounds
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IR – KetonesConjugation effects
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IR – KetonesConjugation effects
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IR – Aldehydes
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UNKNOWN C8H8O
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IR – Carboxylic Acids
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IR – Esters
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UNKNOWN C8H8O2
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IR – Amides
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Nitrogen Containing Compounds
Amides
Amines
Nitro-
Nitrile
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IR – AmidesC5H11NO Isomers
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IR – Amines (Anilines)
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IR – Nitriles and Nitros
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IR Problem 5c (page 92, Intro to Spectroscopy, 3rd Ed.)
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IR Problem 5g (page 94, Intro to Spectroscopy, 3rd Ed.)