What absorbs at 1070 cm⁻¹ in an FTIR spectrum?
A band near 1070 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 1070 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 | 21 | 20 | 1.0 |
| Methacrylate | 18 | 18 | 1.0 |
| Acetate | 18 | 18 | 1.0 |
| Methoxy (OCH3) | 17 | 17 | 1.0 |
| Silicon-oxygen (Si-O) | 12 | 11 | 1.0 |
| Siloxane (Si-O-Si) | 9 | 8 | 1.0 |
| Alkyl C-H | 8 | 8 | 1.0 |
| Phosphate (PO4) | 7 | 7 | 1.0 |
| Hydroxyl (O-H) | 7 | 5 | 1.0 |
| Silicon (Si) | 6 | 5 | 1.0 |
| Carbohydrate | 4 | 3 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Metal oxygen | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| Carbonate | 3 | 3 | 1.0 |
| Phosphorus | 3 | 3 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Hydrogen bond | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| N h | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Chitosan | 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 |
|---|---|---|---|
| silica | 1070, 1100, 1080 | Methacrylate, Acetate | 1 |
| calcium phosphate | 1070, 1149, 600 | C-O single bond, Methoxy (OCH3), Methacrylate | 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 1070 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
-
Metal oxygen confidence 1.0
“The bands at 1070 oxygen vacancies and extrinsic oxygen vacancies induced by and that cm(cid:1)1 REs3þ δ(Ce-O-Ce) doping with around 858 are postulated to be mode [28].”
Structural and spectroscopic studies of rare earths doped ceria (RELa,Sc,Yb_CeO2) nanopowders DOI: 10.1016/j.ceramint.2014.01.076 -
Siloxane (Si-O-Si) confidence 1.0
“(cid:126)AS(cid:33) However, subtle changes in the shape and intensity of the main Si-O-Si asymmetric stretch cm(cid:50)1 indicate that the films have a different structure than that of standard thermal vibration at 1070 (cid:126)FWHM(cid:3”
Landheer 等 - 1998 - Fourier transform infrared spectroscopy of corona- DOI: 10.1116/1.589870 -
C-O single bond confidence 1.0
“If Glyoxal oligomer peaks at 1070 950 and 980 cm-1 C-OH both glyoxal monomers are singly hydrated at the outset, a are assigned to free stretch, dioxolane-linked dioxolane ring can be formed through a second, intramoC-OCasymmetricstretch,an”
Loeffler 等 - 2006 - Oligomer formation in evaporating aqueous glyoxal DOI: 10.1021/es060810wCCC -
Acetate confidence 1.0
“+ C-C 1135 unclear 1135 unclear 1134 1134 1136 stretching stretching C-O + C-H 1105 unclear 1107 unclear 1108 1106 1115 stretching rocking (+) (+) C-O 1070 1094 1070 1095 1086 1081 1082 stretching”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Silicon (Si) confidence 1.0
“For etching 50 time higher than 50min, the strong increase in intensities of the relevant Si-H and of the band at 1070 can be related to the 75 min formation of very deep macropores which contains Si crystallites.”
Megouda 等 - 2009 - Bi-assisted chemical etching of silicon in HFCo(N DOI: 10.1016/j.jlumin.2008.09.010 -
confidence 1.0
“∼1070 This peak can be information could be derived from the main silica peak at vibration mode of silica.”
Osswald 和 Fehr - 2006 - FTIR spectroscopic study on liquid silica solution DOI: 10.1007/s10853-006-7327-8 -
Phosphate (PO4) confidence 1.0
“An additional peak is observed in the FTIR spectra for grafted CAP K-4 at cm21, n which is likely due to the P-OH stretch, 1070 as”
Phillips 等 - 2005 - Surface modification of bioceramics by grafting of DOI: 10.1179/174367605X62436 -
confidence 1.0
“C-H bond.12,21,22 were assigned to the stretching mode of a The mer : bioglass solutions) and the fraction of MPMA on the cm(cid:1)1 Si-O-C peak observed at 1070 was attributed to the transparency, phase separation and gelation behavior of”
Ravarian 等 - 2013 - Molecular interactions in coupled PMMA-bioglass hy DOI: 10.1039/c2tb00251e
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.