What absorbs at 932 cm⁻¹ in an FTIR spectrum?
A band near 932 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 932 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PVP | 932, 2983, 1648 | 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 932 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
“1147 C-O in C-O-C of Cornstarch 995 995 1001 1001 C-O stretching of Cornstarch 932”
Investigations of biodegradable polymer blend electrolytes based on Cornstarch: PVP: NH4Cl and its potential application in solid-state batteries DOI: 10.1007/s10854-021-05266-1 -
confidence 1.0
“revealed the presence of Si-O-Hf peaks at 932 The weight loss of the as-prepared SiOC/HfO 2 was about 0.2 wt.% under argon atmorsphere up to 1550 °C, which was much lower than the hafnia-free SiOC composites and exhibited remarkable improve”
Shou 等 - 2012 - Fabrication of the SiOCHfO2 Ceramic Composites by DOI: 10.4028/www.scientific.net/KEM.512-515.912 -
Thiol confidence 1.0
“A(0) is the absorbance value at time t = 0 min The continuous in situ acquisition of infrared spectra during the first 3 days of hydration cm-1 allowed to measure the evolution with time of the absorbance of the 932 band, related to C-A-S-H”
Relation between activator ratio, hydration products and mechanical properties of alkali-activated slag DOI: 10.1016/j.conbuildmat.2020.120940 -
confidence 1.0
“Spectra indicate that the surface copper Cu2+ species remain as during temperature ramping up to 653 K, due to the observation of a strong peak centred at 932 eV that is accompanied by distinct Cu2+ satellite peaks at 939 and 960 eV.”
The interaction of CO with a copper(ii) chloride oxy-chlorination catalyst DOI: 10.1039/d0fd00014k -
confidence 1.0
“The negative bands at 932 cm-1 cm-1 and 927 have probably the same origin as that at 911 in BR, which was assigned to the C15-H and N-H HOOP vibrations [35].”
Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741 -
confidence 1.0
“It shows the oxidation states of Cu, one peak located at 932.5 eV belongs to Cu 2O and other peak at 934 belongs to Cu which is in well agreement with XRD results of vacuumed anneal samples.”
Marangoni effect induced macro porous surface films prepared through a facile sol-gel route DOI: 10.1038/s41598-017-05506-7 -
Phosphate (PO4) confidence 1.0
“LLM confirmed rule peak-group candidate”
Lu 等 - 2021 - Binding of Cd(II) by Amorphous Aluminum Hydroxide- DOI: 10.1155/2021/9943663 -
confidence 1.0
“cm-1 absorption band at ~ 932 was ascribed to stretching X-ray diffraction in non-bridging oxygen bonds (NBO) of Si-O-NBO (Li et al.”
A cost effective SiO2–CaO–Na2O bio-glass derived from bio-waste resources for biomedical applications DOI: 10.1007/s40204-020-00145-0
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