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.
IR Absorptions for Representative Functional Groups. Functional Group: Molecular Motion: Wavenumber (cm-1) alkanes. C n H 2n+2: C-H stretch: 2950-2800: CH 2 bend ~1465: CH 3 bend ~1375: nitro groups-NO 2 (aliphatic) 1600-1530&1390-1300-NO 2 (aromatic) 1550-1490&1355-1315: mercaptans: S-H stretch
After completing this section, you should be able to use an infrared spectrum to determine the presence of functional groups, such as alcohols, amines and carbonyl groups, in an unknown compound, given a list of infrared absorption frequencies.
Table 1: Principal IR Absorptions for Certain Functional Groups Functional Group Names & Example compounds Absorption Ranges(cm-1) [Look for a single absorption
FTIR measurements of functional groups and organic mass in aerosol samples over the Caribbean. Steven F. Maria, Lynn M. Russell, Barbara J. Turpin, Robert J. Porcja. An aircraft-based aerosol sampling in the Caribbean used FTIR and a four-solvent rinsing procedure to separate organic functional groups, sulfate, ammonium, and silicate.
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Functional groups are the portions in an organic molecule that dictate how the molecule will react. To generate the IR spectrum, different frequencies of infrared light are passed through a sample, and the transmittance of light at each frequency is measured.
Here’s a holiday gift for you: An FTIR Basic Organic Functional Group Reference Chart. Functional groups are structural units within organic compounds defined by specific atom and bond arrangements. Infrared is a powerful identification tool for functional groups because of the similar absorption
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37 rows · IR Absorption Frequencies of Functional Groups Containing a Carbonyl (C=O) Functional Group Type of Vibration Characteristic Absorptions (cm-1) Intensity
