What absorbs at 1065 cm⁻¹ in an FTIR spectrum?
A band near 1065 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 1065 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 |
|---|---|---|---|
| Methacrylate | 17 | 17 | 1.0 |
| Acetate | 17 | 17 | 1.0 |
| C-O single bond | 17 | 16 | 1.0 |
| Methoxy (OCH3) | 16 | 16 | 1.0 |
| Phosphate (PO4) | 6 | 6 | 1.0 |
| Siloxane (Si-O-Si) | 5 | 5 | 1.0 |
| Alkyl C-H | 4 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Lignin | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Urea | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Sulfonate | 1 | 1 | 0.95 |
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 | 1065, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| hemicellulose | 1065, 1730, 897 | Methacrylate, Acetate, C-O single bond | 1 |
| silver nanoparticles | 1065, 1636, 1631 | Methacrylate, Acetate, C-O single bond | 1 |
| lignin | 1065, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| lipids | 1065, 1735, 810 | Methacrylate, Acetate, 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 1065 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
-
Alkyl C-H confidence 1.0
“between 1065 and 1123 Interestingly, the C-H bending of MC exhibits distinct small between 1065 and1123 cm-1.”
Aziz 等 - 2022 - The Study of Ion Transport Parameters in MC-Based DOI: 10.3390/membranes12020139 -
Alkyl C-H confidence 1.0
“cm-1 (out of plane), at 1465.9 is C-H in plane bending (scissoring), at 2885 is C-H stretching cm-1 cm-1 (symmetric), and at 1064.71 and also 1111 are stretching ether C-O from -CH 2-OH group in PEG-4000 [12, 19].”
Deswardani 等 - 2017 - Study of Structural and Magnetic Properties of Sil DOI: 10.1088/1757-899X/202/1/012047 -
Amide confidence 1.0
“*** II/COO(cid:3) Amide stretching 1188.83±0.08 1195.40±0.05 0.466±0.025 0.324±0.011 *** *** II/COO(cid:3) Amide stretching 1137.97±0.14 1141.26±0.12 0.649±0.012 0.275±0.010 II/COO(cid:3) Amide stretching 1065.34±0.23 1.084±0.012”
Differentiation in MALDI-TOF MS and FTIR spectra between two pathovars of Xanthomonas oryzae DOI: 10.1016/j.saa.2014.06.056 -
Acetate confidence 1.0
“Complexation was cm-1, cm-1, cm-1, cm-1 C-O-C, observed with the changes of peaks at 1065 1598 2912 and 3396 that corresponds to C=O of COOstretching,C-Hstretching,andO-Hstretching,respectively,ofCMC/PVAblendsystemupontheadditionofNH 4Cl.Th”
An investigation on the abnormal trend of the conductivity properties of CMC/PVA-doped NH4Cl-based solid biopolymer electrolyte system DOI: 10.1007/s11581-018-2734-9 -
Acetate confidence 1.0
“For the carboxymethyl kappa carrageenan, it was also cm-1, observed that the peak at 1065 and 1041 which represented the C-O-C stretching,”
Mobarak 等 - 2015 - Carboxymethyl Carrageenan Based Biopolymer Electro DOI: 10.1016/j.electacta.2015.02.200 -
Water (H2O) confidence 1.0
“These peaks cm-1, 1065 and 1057 which were assigned to the presence of indicated the capability of CNFs to absorb water.”
Nanostructural, Chemical, and Thermal Changes of Oil Palm Empty Fruit Bunch Cellulose Nanofibers Pretreated with Different Solvent Extractions DOI: 10.1007/s12649-017-0098-4 -
Acetate confidence 1.0
“Choline stretch 1172 1060 C-O stretch COH stretch C-O stretch of 1065 1092”
Prediction of Neonatal Respiratory Distress Biomarker Concentration by Application of Machine Learning to Mid-Infrared Spectra DOI: 10.3390/s22051744 -
Acetate confidence 1.0
“cm-1 A band at 1065 has also emerged because of the C-O bond stretching in amino acid [22,39].”
Aziz 等 - 2019 - Fabrication of Interconnected Plasmonic Spherical DOI: 10.3390/nano9111557
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