What absorbs at 1315 cm⁻¹ in an FTIR spectrum?
A band near 1315 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 1315 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 | 18 | 16 | 1.0 |
| C-O single bond | 6 | 6 | 1.0 |
| Carbohydrate | 6 | 5 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Lignin | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| S eq o | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Oxalate | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Phosphate (PO4) | 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 |
|---|---|---|---|
| nanocellulose | 1315, 1540, 1646 | Alkyl C-H, Carbohydrate, C-O single bond | 2 |
| zinc oxide | 1315, 1627, 1638 | Alkyl C-H, C-O single bond, Methoxy (OCH3) | 1 |
| zinc oxide nanoparticles | 1315, 1744, 1627 | Alkyl C-H, Methoxy (OCH3), C-O single bond | 1 |
| polymer | 1315, 1718, 1722 | Alkyl C-H, C-O single bond, Methoxy (OCH3) | 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 1315 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
-
Acetate confidence 1.0
“The band at 1315 is due to C-O stretchteristicpeakofZnOGWnanoparticlesat385nm.”
Dhayalan 等 - 2021 - Eco friendly synthesis and characterization of zin DOI: 10.1515/nanofab-2020-0104 -
Acetate confidence 1.0
“Also detected are the peaks at 1315 and 895 cm-1 which corresponds to C-O symmetric stretching and C-H deformation respectively.”
Indarti 等 - 2019 - Silylation of TEMPO oxidized nanocellulose from oi DOI: 10.1016/j.ijbiomac.2019.05.161 -
Acetate confidence 1.0
“The peaks at 1315 and cm-1 plant species were assumed to strongly depend on genetic facwere attributed to C-O stretching vibrations, and the 1250”
Comprehensive chemical analysis of the flower buds of five Lonicera species by ATR-FTIR, HPLC-DAD, and chemometric methods DOI: 10.1016/j.bjp.2018.06.007 -
Alkyl C-H confidence 1.0
“At the same cm1 time, in the region of 1425 related to bending vibrations of -CH 2groups, the signal intensity cm1 decreases, and the intensity of the absorption band at 1315 related to fan-shaped vibrations of - CH 2groups, which are assoc”
Makhliyo 等 - 2023 - Preparation of oxidized nanocellulose by using pot DOI: 10.21203/rs.3.rs-2033622/v1 -
Carbohydrate confidence 1.0
“These peaks are shown to be the cellulose peaks if there are -CH bending vibration 3 cm-1 cm-1,1315 cm-1, cm-1 cm-1 at 1460 ,CH bending at 1374 1195 and CO stretching at 1058 cm-1 [17, 35, 66].”
Mustary 等 - 2023 - Synthesis and Characterization of Biocomposite Fil DOI: 10.33263/BRIAC133.274 -
Alkyl C-H confidence 1.0
“acetate and methanol solvent extracts produced by 1409.02, 954.33, 901.13, and 704.67 The spectra cm-1 Aspergillus terreus against Anopheles stephensi, Culex showed a sharp absorption band at 1314.66 assigned to C-H quinquefasciatus, and Ae”
Ragavendran 和 Natarajan - 2015 - Insecticidal potency of Aspergillus terreus agains DOI: 10.1007/s11356-015-4961-1 -
Alkyl C-H confidence 1.0
“Moreover, CH bending modes result in the bands at 1315 CAO cm21.”
Shimpi 等 - 2014 - Preparation, Characterization, and Biodegradation DOI: 10.1002/pc.22658 -
Alkyl C-H confidence 1.0
“1118 benzene ring C-C stretching vibration 1180 benzene ring C-H in-plane bending vibration α-Fe 1315 2O 3”
Wu 等 - 2022 - Comparison of Natural and Dyed Fire Opal DOI: 10.3390/cryst12030322
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