What absorbs at 1214 cm⁻¹ in an FTIR spectrum?
A band near 1214 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 1214 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 |
|---|---|---|---|
| C-O single bond | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Water (H2O) | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
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 1214 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
-
N h confidence 1.0
“The FTIR results show an increase of peak intensity at 1214 (NH stretch vibration) 2 after the nitrogen plasma treatment, which confirms that the nitrogen was grafted to the PAL surface in the process of N 2plasma treatment.”
Chen 等 - 2006 - Manipulating the surface properties of polyacrylam DOI: 10.1016/j.eurpolymj.2006.08.007 -
Hydroxyl (O-H) confidence 1.0
“3539.8 Weakly H bonded OH vibrations 3487.1 Weakly H bonded OH vibrations 3166.7 Weakly H bonded OH vibrations 1648.3 H-O-H Symmetric bending vibrations 1214.2 PO4 P=O associated stretching vibrations bond, P=O stretching vibrations 1136.7”
Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique DOI: 10.1002/crat.200900700 -
Amide confidence 1.0
“1024 1017 1017 Sb2S3 Inorganicmetal ions - C-N+stretching 1214 1214 PAni”
Influence of polyaniline doping concentration in (Bi0.5Sb0.5)2S3 thin polycrystalline films on structural, electrical and optical properties DOI: 10.1016/j.jnoncrysol.2010.03.012 -
confidence 1.0
“This carbonyl group has the (C-H stretching), 1249.64 (C-Cl stretching), and cm-1(C-F ability to form a bond with the (N-H) hydrogen donor group 1214.21 stretching).”
An Intragastric Delivery Device Employing FDM Technology: 3D-Printed Tablet Containing Green Developed Mosapride-Saccharin Co-crystals DOI: 10.1208/s12249-023-02578-9 -
Protein confidence 1.0
“The weak bands of 1214 and 1455 cm-1 are attributed to the organic components of dentin (dentinal collagen).”
Marginal Adaptation Assessment for Two Composite Layering Techniques Using Dye Penetration, AFM, SEM and FTIR: An In-Vitro Comparative Study DOI: 10.3390/app11125657 -
Acetate confidence 1.0
“The band at cm-1 1214 in fumaric acid is attributed to the C-O (H) stretching vibration [30].”
Kumar 和 Barth - 2010 - Following Enzyme Activity with Infrared Spectrosco DOI: 10.3390/s100402626 -
Acetate confidence 1.0
“trum region, the bands at 1600 cm-1, 1510 cm-1 and 1120 cm-1 were assigned to C=O, C-H, Subsequentbandsofreducedintensityat1460cm-1, 1425cm-1, 1380cm-1, 1280cm-1, and C-O deformation, bending, or stretching vibrations of different groups in”
Kwasniewska-Sip 等 - 2021 - Chemical Changes of Wood Treated with Caffeine DOI: 10.3390/ma14030497 -
Water (H2O) confidence 1.0
“at 1214 No significant bands for symmetric stretching phate moiety, releasing the hydrogen-bonded water molwere displayed for this concentration sample.”
Mijatovic 等 - 2017 - Analysis of pulmonary surfactant by Fourier transf DOI: 10.17305/bjbms.2016.1680
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