INFRARED (IR) SPECTROSCOPY

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 (  E n = (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 CCl 4 solution neat CCl 4 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; 1 o vs 2 o vs 3 o

IR – Unknown (C 6 H 14 O)

IR – Ethers

IR – Carbonyl compounds

IR – Ketones Conjugation effects

IR – Ketones Conjugation effects

IR – Aldehydes

UNKNOWN C 8 H 8 O

IR – Carboxylic Acids

IR – Esters

UNKNOWN C 8 H 8 O 2

IR – Amides

Nitrogen Containing Compounds Amides Amines Nitro- Nitrile

IR – Amides C 5 H 11 NO Isomers

IR – Amines (Anilines)

IR – Nitriles and Nitros

IR Problem 5c (page 92, Intro to Spectroscopy, 3 rd Ed.)

IR Problem 5g (page 94, Intro to Spectroscopy, 3 rd Ed.)