What absorbs at 3277 cm⁻¹ in an FTIR spectrum?
A band near 3277 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 7 cited sources
Quick answer
A band near 3277 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 |
|---|---|---|---|
| Hydrogen bond | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 0 | 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 |
|---|---|---|---|
| Cellulose | 3277, 1735, 1650 | Alkyl C-H, Hydroxyl (O-H), Amide | 2 |
| pectin | 3277, 1746, 1150 | Alkyl C-H, Hydroxyl (O-H), Amide | 1 |
| curcumin | 3277, 1063, 1153 | Amide, 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 3277 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
-
C c single bond confidence 1.0
“5B) shows Chen B-Y, Hsueh C-C, Chen W-M (2011) Exploring decolorization the disappearance of peaks at 3277, 2927, 2850, and and halotolerance characteristics by indigenous acclimatized cm-1 2359 as well as 1592, 1409, 1225, 1075, and bacter”
Biodegradation and decolorization of azo dyes by adherent Staphylococcus lentus strain DOI: 10.1007/s13765-016-0169-4 -
Hydrogen bond confidence 1.0
“Fourier Transform Infrared Spectroscopy cm-1 The most intense absorption peaks of C20, Figure 1, are found in 3342 due to OH frequency C3-OH···O5 region of intramolecular hydrogen bond vibration of secondary alcohol jointly with cm-1 the 32”
Concepcion Rodriguez-Robledo 等 - 2018 - Cellulose-Silica Nanocomposites of High Reinforcin DOI: 10.3390/ma11040575 -
Alkyl C-H confidence 1.0
“The shoulder peak obtained at 2926 can be attributed to the asymmetric incorporation of olive oil resulted in a gradual decrease in the peak intensity at 3277 cm-1 cm-1, C-H stretching of aliphatic groups of the sucrose molecule [38].”
Dhal 等 - 2023 - Formulation and Characterization of Emulgel-Based DOI: 10.3390/gels9060466 -
Hydrogen bond confidence 1.0
“190 Fibers properties.5,46 triclinic I mechanical and thermal In addition, cellulose, whereas the band close to α cm-1 an intra-molecular hydrogen bond vibration for 3277 is proportional to the amount of”
Kempaiah 等 - 2020 - FTIR AND WAXS STUDIES ON SIX VEGETAL FIBERS DOI: 10.1016/j.carres.2005.08.007 -
Amide confidence 1.0
“(cm-1) Wavenumber Assigned Biochemical Component Vibrational Mode 3277 Amide A: peptide, protein N-H stretching 3053”
Metabolic Profile Characterization of Different Thyroid Nodules Using FTIR Spectroscopy: A Review DOI: 10.3390/metabo12010053 -
Hydrogen bond confidence 1.0
“α cm-1 band at 3221 is assigned to the intramolecular hydrogen bonds present only in triclinic I α cm-1 cellulose, whereas the band at close to 3277 is proportional to the amount of monoclinic cellulose I β.”
Poletto 等 - 2014 - Native Cellulose Structure, Characterization and DOI: 10.3390/ma7096105 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Sakhare 等 - 2021 - Studies on Formulation and Evaluation of Eudragit DOI: 10.5530/ijper.55.1s.40
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