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Table of Characteristic IR Absorptions m=medium, w=weak, s=strong, n=narrow, b=broad, sh=sharp frequency, cm –1 bond functional group 3640–3610 (s, sh) O–H stretch, free hydroxyl alcohols, phenols 3500–3200 (s,b) O–H stretch, H–bonded alcohols, phenols
IR Tables, UCSC Table 1. 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.) 1650 – 1600 (conj.) w to m =C-H bend 995 – 685 s See Table 2 for detail Alkynes
Table of Characteristic IR Absorptions. Infrared Spectroscopy –Analytical chemistry laboratory, ICT Prague. THEORY. An important tool of the analytic and organic chemists is Infrared (IR) Spectroscopy. IR spectra are acquired on a special instrument, called an IR spectrometer.
Infrared Tables (short summary of common absorption frequencies) The values given in the tables that follow are typical values. Specific bands may fall over a range of wavenumbers, cm-1. Specific substituents may cause variations in absorption frequencies.
Infrared Tables (short summary of common absorption frequencies) The values given in the tables that follow are typical values. Specific bands may fall over a range of wavenumbers, cm-1. Specific substituents may cause variations in absorption frequencies.
IR correlation table. Characteristic IR band positions for important functional groups. IR absorption band intensities (≠ Raman intensities) are given as: s - strong, m - medium, wk - weak, var - variable. Functional. Band position.
3200 -3300. 3000 - 3200. 2900 - 3000. 2700 -2800. 2200 2100 (weak or absent if highly symmetrical) 2350. 1600 - 1670 weak unless conjugated. 1600 - 1700. 1350 and 1550.
