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When analyzing an IR spectrum, it is helpful to overlay the diagram below onto the spectrum with our mind to help recognize functional groups. Figure 1. Group frequency and fingerprint regions of the mid-infrared spectrum. The region of the infrared spectrum from 1200 to 700 cm-1 is called the fingerprint region.
16 Δεκ 2021 · The broad shape of the absorption band results from the hydrogen bonding of the OH groups between molecules. The OH bond of alcohol group usually has absorption in the range of 3200-3600 cm -1, while the OH bond of carboxylic acid group occurs at about 2500-3300 cm -1 (Figure 6.4a and Figure 6.4c).
IR SPECTRUM OF ALDEHYDES AND KETONES. Carbonyl compounds are those that contain the C=O functional group. In aldehydes, this group is at the end of a carbon chain, whereas in ketones it’s in the middle of the chain.
Be able to analyze an IR spectrum for important functional group bands. With the basic understanding of the IR theory, we will take a look at the actual output from IR spectroscopy experiments, and learn how to get structural information from IR spectrum.
By learning where characteristic functional-group absorptions occur, it’s possible to get structural information from IR spectra. Table 12.1 lists the characteristic IR bands of some common functional groups.
3 Μαΐ 2023 · With the deepening of research, the experimental results of Solomon et al. (4,6,7,9−17) show that the infrared spectrum of OH groups of most coal samples has a broadened absorption peak between 3500 and 3200 cm –1, and some sharp small absorption peaks will appear in the area of 3700–3590 cm –1.
Sample IR Spectra : heteroatom functional groups. By looking at IR spectra that contain known functional groups and comparing and contrasting them with other IR spectra, one can develop the skills required to be able to "interpret" an "unknown" IR spectra.
