INTERPRETING AN INFRA-RED SPECTRUM

This page explains how to use an infra-red spectrum to identify the presence of a few simple bonds in organic compounds.   The infra-red spectrum for a simple carboxylic acid Ethanoic acid Ethanoic acid has the structure: You will see that it contains the following bonds: carbon-oxygen double, C=O carbon-oxygen single, C-O oxygen-hydrogen, O-H carbon-hydrogen, C-H carbon-carbon single, C-CThe carbon-carbon bond has absorptions which occur over a wide range of wavenumbers in the fingerprint...

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Instrumental Techniques for Analytical Chemistry

Introduction Infrared (IR) spectroscopy is one of the most common spectroscopic techniques used by organic and inorganic chemists. Simply, it is the absorption measurement of different IR frequencies by a sample positioned in the path of an IR beam. The main goal of IR spectroscopic analysis is to determine the chemical functional groups in the sample. Different functional groups absorb characteristic frequencies of IR radiation. Using various sampling accessories, IR spectrometers can accept a wide range of sample types such as gases, liquids, and solids. Thus, IR spectroscopy is an important and popular tool for structural elucidation and compound identification. IR Frequency Range and Spectrum...

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Infrared Spectroscopy Chemical Analisys

General Uses • Identification of all types of organic and many types of inorganic compounds • Determination of functional groups in organic materials • Determination of the molecular composition of surfaces • Identification of chromatographic effluents • Quantitative determination of compounds in mixtures • Nondestructive method • Determination of molecular conformation (structural isomers) and stereochemistry (geometrical isomers) • Determination of molecular orientation (polymers and solutions) Common Applications • Identification of compounds by matching spectrum of unknown compound with reference spectrum (fingerprinting) • Identification of functional groups in unknown substances Identification...

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