Amide — FTIR absorption peaks and assignments
These are the characteristic FTIR wavenumbers where Amide tends to absorb, compiled from published literature and ranked by supporting evidence. Each assignment is traceable to a source (DOI) and cross-validated against our 320,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
Amide is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.
Characteristic FTIR peaks for Amide
| Wavenumber (cm⁻¹) | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| 1650 | 248 | 213 | 1.0 |
| 1550 | 118 | 105 | 1.0 |
| 1640 | 105 | 96 | 1.0 |
| 1700 | 100 | 91 | 1.0 |
| 1660 | 92 | 78 | 1.0 |
| 1600 | 91 | 79 | 1.0 |
| 1740 | 90 | 81 | 1.0 |
| 1630 | 86 | 77 | 1.0 |
| 1655 | 85 | 80 | 1.0 |
| 1540 | 83 | 74 | 1.0 |
| 1730 | 78 | 74 | 1.0 |
| 1720 | 71 | 66 | 1.0 |
| 1735 | 59 | 58 | 1.0 |
| 1545 | 53 | 46 | 1.0 |
| 1645 | 52 | 49 | 1.0 |
| 1656 | 50 | 43 | 1.0 |
| 1240 | 48 | 44 | 1.0 |
| 1652 | 47 | 45 | 1.0 |
| 1654 | 47 | 44 | 1.0 |
| 3300 | 47 | 43 | 1.0 |
| 1635 | 42 | 41 | 1.0 |
| 1637 | 42 | 38 | 1.0 |
| 1644 | 41 | 37 | 1.0 |
| 1638 | 41 | 37 | 1.0 |
| 1500 | 41 | 34 | 1.0 |
| 1651 | 40 | 37 | 1.0 |
| 1750 | 39 | 37 | 1.0 |
| 1639 | 39 | 36 | 1.0 |
| 1653 | 39 | 35 | 1.0 |
| 1657 | 36 | 31 | 1.0 |
Showing the 30 best-supported peaks of 1462 total for Amide.
Possible materials
Spectrum logic
A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.
Real-world usage
These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.
Common mistakes
- Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
- Assuming the strongest band is always the most diagnostic one.
- Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.
Verification advice
Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.
Literature behind these assignments
-
1735 cm⁻¹ confidence 1.0
“The new peak appears cm-1 at 1735 which indicates the presence of a C=O bond from carboxylic acid.”
Synthesis and Physical Properties Characterization of Montmorillonite-modified Carbon Nanotubes Filler DOI: 10.1088/1757-899X/546/4/042004 -
1566 cm⁻¹ confidence 1.0
“1566cm-1, R2 due to NH in-plane bending, triazine stretching In every case a, good linear fit was obtained with valand C-N stretching, respectively, [23] and so, these bands ues >0.999.”
Determination of cyromazine in pesticide commercial formulations by vibrational spectrometric procedures DOI: 10.1016/j.aca.2004.02.063 -
968 cm⁻¹ confidence 1.0
“2000cm-1, 1.21mgg-1 baseline established in for a ChlorThe absorption bands of Chlorpyrifos are located at 1549, pyrifosstandardandthenoisemeasuredinthesameregionfor 968cm-1, 1412, 1339, 1165, 1088, 1025 and due to C N a blank spectrum and”
A validated and fast procedure for FTIR determination of Cypermethrin and Chlorpyrifos DOI: 10.1016/j.talanta.2005.03.008 -
1650 cm⁻¹ confidence 1.0
“CdO cm-1, the band in the ester group at 1751 that of 1700 cm-1 CdO cm-1 On the other hand, the Acesulfame-K band at 945 does due to the stretch in carboxylic acids, and the band CdO cm-1 not overlap with any Aspartame band, but the low sig”
Armenta 等 - 2004 - FTIR determination of aspartame and acesulfame-k i DOI: 10.1021/jf049218l -
1713 cm⁻¹ confidence 1.0
“This means that the addition shows sharp absorption and low intensity at 1712.8 cm-1 of DVB is able to shift the hydroxyl bonds in blends, which indicates the presence of C=O carbonyl so that DVB makes the blends more compatible.”
Grafting of Oleic Acid On Cyclic Natural Rubber Resiprene-35 Using Dicumyl Peroxide Initiator and Divinylbenzene Compatibilizers For Paint Binder In Polyamide Thermoplastics DOI: 10.13005/ojc/350119 -
1297 cm⁻¹ confidence 1.0
“Other less important absorption bands are located at 1582 CdC cm-1, due to the stretching in chloroalkenes, and 1297 cm-1, and 1175 corresponding to amide and benzene ring breathing, respectively (20).”
FTIR Approaches for Diuron Determination in Commercial Pesticide Formulations DOI: 10.1021/jf050268f -
1632 cm⁻¹ confidence 1.0
“The transport mechanism of showed amide I and II absorption peaks at 1632 and 1554 19 cm@1, hydrogels was a combination of non-Fickian and Super Case II.”
pH‐Responsive Studies of Bacterial Cellulose /Chitosan Hydrogels Crosslinked with Genipin: Swelling and Drug Release Behaviour DOI: 10.1002/slct.201902290 -
1723 cm⁻¹ confidence 1.0
“The characteristics sharp peak at 1723 is attributed to stretching vibration of carbonyl (-C=O) group from GMSG/VMSG [46, 47], the intensity of which increases with the increase of GMSG/VMSG contents in the membrane”
Novel Silica Functionalized Monosodium Glutamate/PVA Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis DOI: 10.21203/rs.3.rs-283846/v1
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