What absorbs at 1316 cm⁻¹ in an FTIR spectrum?
A band near 1316 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 1316 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Protein | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Sulfur | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| membrane | 1316, 2927, 1369 | Alkyl C-H, Amide | 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 1316 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
-
Carbonyl (C=O) confidence 1.0
“The D cm-1 symmetric carbonyl stretching bands are located at 1316 and 1324 for COM and COD, E cm-1 respectively.”
Quantitative analysis of calcium oxalate hydrate urinary stones using FTIR and 950/912 cm-1 peak ratio DOI: 10.1016/j.vibspec.2019.03.006 -
Alkyl C-H confidence 1.0
“The peak at 1316 vanishes 2 cm-1 cm-1 cm-1 plane bending and CH2 wagging, respectively [35].”
Innovative Green Chemistry Approach to Synthesis of Sn2+-Metal Complex and Design of Polymer Composites with Small Optical Band Gaps DOI: 10.3390/molecules27061965 -
Alkyl C-H confidence 1.0
“CH2 wagging has been identified as the reason for the pure PVA absorption peak at cm-1 has been associated with the pure PVA absorption peak at 1316 [32].”
From Green Remediation to Polymer Hybrid Fabrication with Improved Optical Band Gaps DOI: 10.3390/ijms20163910 -
Protein confidence 1.0
“3 350 cm after storage at 4 and 25 The band was cm_1 Another typical protein absorption located at 1316 was presented in the original spectra of CWMs in plums at harvest;”
Geng 等 - 2020 - Quality Attributes and Microstructure of Cell Wall DOI: 10.3136/fstr.26.281 -
Protein confidence 1.0
“Amide III of proteins corresponds to 1316 The various bending vibration of 1541 cm-1, cm-1,”
Toxicity mechanism of Cu2+ ion individually and in combination with Zn2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis DOI: 10.1007/s10867-020-09560-7 -
Amide confidence 1.0
“cm(cid:0) 1+ × + × b b 1 C=N (C-H (N-H Hg Cu stretching), 1593 bending and vibration), 1406 e,Hg e,Cu cm(cid:0) cm(cid:0) (COO1 1 (C-N symmetric stretching), 1316 stretching vibra-”
Investigation of mercury (II) and copper (II) sorption in single and binary systems by alginate/polyethylenimine membranes DOI: 10.1016/j.carbpol.2020.117588 -
Carboxyl (COOH) confidence 1.0
“The choice of the cellulose constituent, and is related to the different process parameters during peracetic acid contents of crystallized and amorphous cellulose.33 treatment of the pulp can lead to the desired Peracetic acid treated pulp”
Sharma 等 - 2022 - RESPONSE SURFACE METHODOLOGY FOR OPTIMIZATION OF P DOI: 10.1016/j.jclepro.2009.02.017 -
Amide confidence 1.0
“Preparation of CH film cm-1 A is the area of the band located at 1316 (characwhere 1 CH film was prepared by dissolution in 50 mL of 1% aqueous teristic band of amide III) and A the area of the reference band 2 acid solution.”
NaOH treatment of chitosan films: Impact on macromolecular structure and film properties DOI: 10.1016/j.carbpol.2015.05.077
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