What absorbs at 1000 cm⁻¹ in an FTIR spectrum?
A band near 1000 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 1000 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
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 |
|---|---|---|---|
| alumina | 1000, 460, 1380 | Silicon-oxygen (Si-O) | 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 1000 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-O bond confidence 1.0
“The peaks observed in IR at bending peak observed at in IR and no peaks observed in 1000cm(cid:2)1 1106 and 961 and in Raman at 1103 and”
Arjunan 等 - 2012 - Quantum chemical studies and vibrational analysis DOI: 10.1016/j.saa.2012.08.053 -
Alkene (C=C) confidence 1.0
“stretching), while the peaks within the range of 1000The pre-processing also significantly showed that the cm-1 could be seen through the absorption of alkenes 650 quantified FTIR spectra were distributed normally with functional group C-H”
Aziz 等 - 2020 - FTIR and HPLC-Based Metabolomics of Yacon Leaves E DOI: 10.22146/ijc.43453 -
Carbohydrate confidence 1.0
“This present study found that a peak at wavelength 1000 shows changes in proteoglycan, as also recorded in the previous studies [26].”
Aziz 等 - 2023 - Diagnosis of Osteoarthritis at an Early Stage via DOI: 10.3390/pr11020404 -
Carbon dioxide confidence 1.0
“The deformation band of C=O at around 1000 and cm-1 absorption peaks observed ordinary between 2300 and 2400 due to adsorbed CO 2”
Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method DOI: 10.1016/j.spmi.2016.11.069 -
Silicon (Si) confidence 1.0
“In the spectrum peaks are observed cm-1 cm-1 in the region of 1258.88 corresponding to methyl, between 1000 - 1100 a peak cm-1 corresponding to the Si-O-Si bond and a band at 792.10 characteristic of the siloxanes, confirming the presence o”
Balvín Beltrán 等 - 2020 - Funcionalización del gel de polisiloxano con nanop DOI: 10.1038/srep35446 -
Carboxyl (COOH) confidence 1.0
“Carboxylic acid bending vibrations (<1000 Of course the EGF protein already has this mode as it is a polypep-”
Castilho 等 - 2017 - FT-IR characterization of a theranostic nanoprobe DOI: 10.1016/j.snb.2016.09.011 -
Alkyl C-H confidence 1.0
“The band at 2918 denoted the AC C-H stretching vibration of the alkane functional group, while the bands between 1000 and 800”
Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042 -
Acetate confidence 1.0
“The band frequency between 1000 and 1150 is associated with the stretching vibrations of -C-Oand (-C-O-C-) [42] and accordingly a stretching peak was cm-1.”
Effect of alumina on the performance and characterization of cross-linked PVA / PEG 600 blended membranes for CO2/N2 separation DOI: 10.1016/j.seppur.2018.08.026
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.