What absorbs at 3417 cm⁻¹ in an FTIR spectrum?
A band near 3417 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 3417 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 20 | 20 | 1.0 |
| N h | 5 | 5 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| chitosan | 3417, 1650, 1655 | Alkyl C-H, Hydroxyl (O-H), N h | 1 |
| hydroxyapatite | 3417, 1620, 1639 | Hydroxyl (O-H), Alkyl C-H | 1 |
| CaCO3 | 3417, 1141, 712 | Alkyl C-H, Hydroxyl (O-H) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3417 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 1.0
“the -OH stretching to 3417.”
Cahyono 等 - 2018 - Characteristics of eugenol loaded chitosan-tripoly DOI: 10.1088/1757-899X/349/1/012010 -
Hydroxyl (O-H) confidence 1.0
“Infrared Spectroscopy The IR spectrum of the levan from Bacillus subtilis strain MZ292983.1 showed a charBacillus subtilis The IR spectrum of the levan from strain MZ292983.1 showed a characacteristic broad stretching peak of OH around 3417”
Bio_Fabricated Levan Polymer from Bacillus subtilis MZ292983.1 with Antibacterial, Antibiofilm, and Burn Healing Properties DOI: 10.3390/app12136413 -
Carboxyl (COOH) confidence 1.0
“2a), the peaks at 3417, 2924, 1624, cm-1 and 1033 are attributed to the stretching vibrations 1411 COO-”
Karthika 等 - 2016 - Gellan gum-graft-polyaniline-An electrical conduct DOI: 10.1016/j.ijbiomac.2015.10.061 -
Alkyl C-H confidence 1.0
“The FTIR spectrum of CLCG revealed that the N-H and O-H stretching vibration at 3439 cm-1, cm-1 cm-1, shifts to 3417 the CH symmetric stretch at 2925 shifts to 2937 the C=O stretching 3 cm-1”
Synthesis, Characterization, and Antibacterial Activity of Cross-Linked Chitosan-Glutaraldehyde DOI: 10.3390/md11051534 -
Hydroxyl (O-H) confidence 1.0
“cm-1 It is evident from Fig 4 that the peaks appeared at 3417.24 and 1631.12 for DG1 and C cm-1 at 3418.52 and 1635.33 for electrocoagulated flocs residue of DG1 due to presence of O-H, cm-1 C N-H and C=O stretching vibrations.”
Sakthisharmila 等 - 2017 - A characteristic study on generation and interacti DOI: 10.1016/j.molliq.2017.01.106 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Experimental data on the characterization of hydroxyapatite synthesized from biowastes DOI: 10.1016/j.dib.2019.104485 -
Hydroxyl (O-H) confidence 1.0
“In the spectrum of PF, the charg/cm3, cm-1 sity of 0.6 the PF resin addition amount of acteristic peaks at 3417 (O-H stretch) and 1606 12%, and the AC foaming agent addition amount of (C-H stretch) were the typical bands of PF resin.”
Preparation, morphology, FTIR and performance properties of foaming particleboard DOI: 10.1186/s10086-021-01984-6 -
Hydroxyl (O-H) confidence 1.0
“As shown in Figure 3a, the broad band peak at 3417cm-1 was assigned to -OH stretching vibrations of carboxymethyl chitosan, which overlapped with -NH stretching vibrations.”
Sponges of Carboxymethyl Chitosan Grafted with Collagen Peptides for Wound Healing DOI: 10.3390/ijms20163890
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