The following table lists infrared spectroscopy absorptions by frequency regions.

Table 1. Characteristic IR Absorption Peaks of Functional Groups* * Abbreviations: s = strong; m = medium; w = weak; br = broad; sat. = saturated; conj. = conjugated ** Alcohols, Esters, Carboxylic Acids, and Anhydrides also absorb in the fingerprint region due to the C-O stretch (1300 – 1000, s). Table 2.

An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported in wavenumber, for common types of molecular bonds and functional groups.

Detailed information about the infrared absorptions observed for various bonded atoms and groups is usually presented in tabular form. The following table provides a collection of such data for the most common functional groups.

2025年1月5日 · An IR spectrum cheat sheet is a valuable tool for interpreting IR spectra, providing quick and easy reference to the characteristic absorption frequencies of common functional groups. This cheat sheet typically includes a table or chart that lists the functional groups, their corresponding absorption frequencies, and the associated IR bands.

Table of Characteristic IR Absorptions. You can download this chart as a printable acrobat pdf file.

2015年12月21日 · Easy-to-read chart of basic organic functional groups, their positions of infrared bans, their relative peak intensities, and their functional group representation.

IR SPECTRUM OF ALKANES. Alkanes have no functional groups. Their IR spectrum displays only C-C and C-H bond vibrations. Of these the most useful are the C-H bands, which appear around 3000 cm-1. Since most organic molecules have such bonds, most organic molecules will display those bands in their spectrum.

Primary amines produce two N-H stretch absorptions, secondary amides only one, and tetriary none. The carbonyl stretching absorption is one of the strongest IR absorptions, and is very useful in structure determination as one can determine both the number of carbonyl groups (assuming peaks do not overlap) but also an estimation of which types.

FT-IR Spectroscopy; IR Absorption Frequencies ; Typical IR Absorption Frequencies For Common Functional Groups. Bond Functional Group Frequency in cm −1 (Intensity*) C–H: Alkane: 3000–2850 (s) –CH 3: 1450 and 1375 (m)