Αποτελέσματα Αναζήτησης
This IR spectrum is from the Coblentz Society's evaluated infrared reference spectra collection.
The following table provides a collection of such data for the most common functional groups. Following the color scheme of the chart, stretching absorptions are listed in the blue-shaded section and bending absorptions in the green shaded part.
Based in the infrared spectrum diagram for benzaldehyde, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if benzaldehyde has a functional group with a particular characteristic wavenumber peak.
1 Αυγ 2012 · We have revealed spectral features that characterize the participation of C=O groups of unsubstituted benzaldehyde molecules in the occurrence of intermolecular hydrogen bonds C=O...H-C with...
Summary: H–C =O stretch 2830-2695 cm -1. C=O stretch: aliphatic aldehydes 1740-1720 cm -1. alpha, beta-unsaturated aldehydes 1710-1685 cm -1. The spectra of benzaldehyde and butyraldehyde are shown below.
Carbonyl functional groups are the easiest to identify of all IR absorptions because of their sharp, intense peak in the range 1670 to 1780 cm–1. Most important, the exact position of absorption within this range can often be used to identify the exact kind of carbonyl functional group—aldehyde, ketone, ester, and so forth.
Identifying Functional Groups from an IR Spectrum. The IR spectrum of an unknown compound is shown in Figure 12.28. What functional groups does the compound contain?
