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Infrared spectroscopy chart1/18/2024 ![]() An infrared spectrum shows a series of absorptions drawn on a graph type. ![]() 3500-3300 alcohol, COH or amine, CNR2 alcohol is strong, broad amine is usually weak/medium. This application note describes several approaches to the measurement and analysis of IR spectra of. Summary of IR values wavenumber functional group description. IR spectroscopy is useful when it comes to analysis of inorganic compounds (such as metal complexes or fluoromanganates) as well. IR radiation covers the electromagnetic spectrum region with a wavelength range. IR spectroscopy is reliable, fast and cost-effective. The absorptions in this range do not apply only to bonds in organic molecules. Although your software will show higher absorbance values, you should not trust to values higher than 2 absorbance units. Two strong, broad bands between 1100-1200 cm -1ġ540 cm -1 (stronger band) and 1380 cm -1 (weaker band) - (Both are always found)ġ520, 1350 cm -1 (conjugation usually lowers the wave number) ![]() In IR spectroscopy, an infrared lamp produces electromagnetic radiation between the wavelengths of 700 nm to 1 mm. Further information: Infrared spectroscopy Bondġ380 cm -1 (weak), 1260 cm -1 (strong) and 2870, 2960 cm -1 (both strong to medium)ġ470 cm -1 (strong) and 2850, 2925 cm -1 (both strong to medium)ĩ00 cm -1 (strong) and 2975, 3080 cm -1 (medium)ħ00-750 cm -1 (strong) and 700☑0 cm -1 (strong)ħ50-800 cm -1 (strong) and 860-900 cm -1 (strong)ġ450, 1500, 1580, 1600 cm -1 (strong to weak) - usually 3 or 4Ģ190-2260 cm -1 (very weak, sometimes not visible)ġ685 cm -1 (goes for aromatic ketones as well)ġ725 cm -1 (influence of conjugation like with ketones)ġ735 cm -1 (influence of conjugation and ring size like with ketones)ġ550-1610 cm -1 (goes for aminoacid zwitterions as well)ģ610-3670 cm -1 (concentrating samples broadens the band and moves it to 3200-3400 cm -1)ģ500-3560 cm -1 (concentrating samples broadens the band and moves it to 3000 cm -1)ĭoublet between 3400-3500 cm -1640 cm -1 (strong)īroad bands with multiple peaks between 2400-3200 cm -1ġ100-1300 cm -1 (two bands - distinction to ketones, which do not possess C-O!)ġ615-1700 cm -1 (similar conjugation effects to C=O)Ģ210-2260 cm -1 (unconjugated 2250, conjugated 2230 cm -1) (medium)Ģ165-2110 cm -1 (2140 - 1990 cm -1 for R-N=C=S) Reading: Vibrational Spectroscopy Revised: 2/24/15 The most widely used vibrational spectroscopy is Infrared (IR) spectroscopy. ![]()
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