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Date: 10-8-2018
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Date: 11-8-2019
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Date: 13-8-2019
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Other Functional Groups
Infrared absorption data for some functional groups not listed in the preceding table are given below. Most of the absorptions cited are associated with stretching vibrations. Standard abbreviations (str = strong, wk = weak, brd = broad & shp = sharp) are used to describe the absorption bands.
Functional Class |
Characteristic Absorptions |
---|---|
Sulfur Functions |
|
S-H thiols | 2550-2600 cm-1 (wk & shp) |
S-OR esters | 700-900 (str) |
S-S disulfide | 500-540 (wk) |
C=S thiocarbonyl | 1050-1200 (str) |
S=O sulfoxide sulfone sulfonic acid sulfonyl chloride sulfate |
1030-1060 (str) 1325± 25 (as) & 1140± 20 (s) (both str) 1345 (str) 1365± 5 (as) & 1180± 10 (s) (both str) 1350-1450 (str) |
Phosphorous Functions |
|
P-H phosphine | 2280-2440 cm-1 (med & shp) 950-1250 (wk) P-H bending |
(O=)PO-H phosphonic acid | 2550-2700 (med) |
P-OR esters | 900-1050 (str) |
P=O phosphine oxide phosphonate phosphate phosphoramide |
1100-1200 (str) 1230-1260 (str) 1100-1200 (str) 1200-1275 (str) |
Silicon Functions |
|
Si-H silane | 2100-2360 cm-1 (str) |
Si-OR | 1000-11000 (str & brd) |
Si-CH3 | 1250± 10 (str & shp) |
Oxidized Nitrogen Functions |
|
=NOH oxime O-H (stretch) C=N N-O |
3550-3600 cm-1 (str) 1665± 15 945± 15 |
N-O amine oxide aliphatic aromatic |
960± 20 1250± 50 |
N=O nitroso nitro |
1550± 50 (str) 1530± 20 (as) & 1350± 30 (s) |
Test your ability to use information from infrared and mass spectrometry to identify an unknown compound. Clicking the button opens a display in which four different problems of this kind may be selected. Answers are provided once an effort to solve the problem has been made.
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