HOW TO APPROACH FOR THE ANALYSIS OF AN IR SPECTRUM Look for the presence (or absence) of a few major functional groups: C = O, O - H, N - H, C - O, C = C, C ≡ C and C ≡ N Do not try to make a detailed analysis of the C - H absorptions near 3000 cm−1 almost all organic compounds have these absorptions 1. IR (infrared) spectroscopy is useful in organic chemistry because it enables you to identify different functional groups. Infrared Spectroscopy 1. Alcohols have IR absorptions associated with both the O-H and the C-O stretching vibrations. Functional groups are the portions in an organic molecule that dictate how the molecule will […] Chemists do not try to interpret every ab-sorption in a spectrum. The IR Spectrum Table is a chart for use during infrared spectroscopy.The table lists IR … In this section, we’ll focus on those. On the immediate high energy side of the visible spectrum lies the ultraviolet, and on the low energy side is the infrared.

Type of Vibration causing IR absorption 3000-2800 (Note: The absorptions can be seen as several distinct peaks in this region.) Z:\files\classes\spectroscopy\typical spectra charts.DOC IR Flowchart to determine functional groups in a compound (all values in cm-1).

Table 1: Principal IR Absorptions for Certain Functional Groups Functional Group Names & Example compounds Absorption Ranges(cm-1) [Look for a single absorption in these regions, unless stated otherwise.] Figure 7. Introduction The light our eyes see is but a small part of a broad spectrum of electromagnetic radiation. This is because each functional group contains certain bonds, and these bonds always show up in the same places in the IR spectrum. Infrared spectroscopy, as a very fast technique, has found application in carbohydrates’ investigation, espe-cially for cell wall polysaccharides with the large diversity of pectins, hemicelluloses and cellulose. Is a carbonyl group present? about functional groups occurring in investigated mole-cules. Note the very broad, strong band of the O–H stretch. w to m … 12.4 FUNCTIONAL-GROUP INFRARED ABSORPTIONS A typical IR spectrum contains many absorptions. IR Tables, UCSC Table 1.

O–H stretch, hydrogen bonded 3500-3200 cm-1; C–O stretch 1260-1050 cm-1 (s) Figure 7. shows the spectrum of ethanol. 1650 – 1600 (conj.) Infrared Spectrum of Ethanol Functional Groups Containing the C-O Bond.

Characteristic IR Absorption Peaks of Functional Groups* Vibration Position (cm-1) Intensity* Notes Alkanes C-H stretch 2990 – 2850 m to s Alkenes =C-H stretch 3100 – 3000 m C=C stretch 1680 – 1620 (sat.) Experience has shown that some absorptions are particularly useful and important in diagnosing or confirming certain functional groups.

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