Post on 14-Jan-2016
INFRARED (IR) SPECTROSCOPY
IR Spectroscopy – The Spectrum
IR Spectroscopy – The Spectrum
IR Spectroscopy
h
IR Spectroscopy - Theory
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.
IR – Bond Properties and Absorption Trends
IR – Modes of Stretching and Bending
IR – Correlation Chart
IR – Pentane; neat vs gas phase vs CCl4 solution
neat
CCl4 solution
Gas phase
IR – Alkyl Halides
IR – Alkenes
IR – Alkenes: Out Of Plane bending (the oop region)
IR – Alkynes
1-heptyne
IR – Aromatics
IR – Aromatics; Substitution Pattern
IR – Alkenes: Out Of Plane bending (the oop region)
IR – Alcohols and Phenols
IR – Alcohols; 1o vs 2o vs 3o
IR – Unknown (C6H14 O)
IR – Ethers
IR – Carbonyl compounds
IR – KetonesConjugation effects
IR – KetonesConjugation effects
IR – Aldehydes
UNKNOWN C8H8O
IR – Carboxylic Acids
IR – Esters
UNKNOWN C8H8O2
IR – Amides
Nitrogen Containing Compounds
Amides
Amines
Nitro-
Nitrile
IR – AmidesC5H11NO Isomers
IR – Amines (Anilines)
IR – Nitriles and Nitros
IR Problem 5c (page 92, Intro to Spectroscopy, 3rd Ed.)
IR Problem 5g (page 94, Intro to Spectroscopy, 3rd Ed.)