What absorbs at 538 cm⁻¹ in an FTIR spectrum?
A band near 538 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 538 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) | 6 | 6 | 1.0 |
| Metal oxygen | 5 | 5 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Phosphorus | 1 | 0 | 1.0 |
| Phosphate (PO4) | 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 |
|---|---|---|---|
| hematite | 538, 1030, 469 | Silicon-oxygen (Si-O), Siloxane (Si-O-Si), Silicon (Si) | 1 |
| goethite | 538, 1470, 696 | Metal oxygen, 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 538 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 O 1s peak at 538 eV in the scans of PGV and PGN nanoclays was due to the presence of metallic oxides O-M (M: Si, Al, Fe,”
Fareed 和 Stamboulis - 2014 - Nanoclays reinforced glass ionomer cements disper DOI: 10.1007/s10856-013-5058-3 -
confidence 1.0
“Recycle of the CS-Zn 0.15Sn 0.85O photocatalyst between zinc-tin oxide and characteristic band at 538 and cm-1 (stability 635 The photocatalyst is an important parameter and attributed to the Zn-O and Sn-O-Sn stretching reusability) (ZnO 2)”
Hybrid structure of biotemplate-zinc-tin oxide for better optical, morphological and photocatalytic properties DOI: 10.1088/1361-6641/aa577c -
confidence 1.0
“The (M-S) stretching frequency is observed from 538cm-1 the presence of the peaks at 583 and [18] of which the peak The FTIR spectra of the Zr-doped SnS nanopowders are shown in 2 583cm-1 538cm-1 SneS 3140cm-1observed at corresponds to bond”
Synthesis and characterization of Zr-doped SnS2 nanopowders by a simple soft chemical route towards magnetic and antibacterial applications DOI: 10.1016/j.surfin.2017.08.001 -
confidence 1.0
“The strong bending vibration at ~ 538 is scatter of hematite, which is the main crystalline mineral in cm-1 assigned to Fe-bearing phyllosilicates (chlorite, biotite, etc.).”
An integrated toolkit using multiple methods for determining the potential sources of iron and manganese in groundwater: a case study from the lower Kelantan River Basin, Malaysia DOI: 10.1007/s12665-021-09756-7 -
Carbohydrate confidence 1.0
“The cm(cid:3)1 strong absorption peak at 538 was confirmed to be characteristic of sugar derivatives.”
Isolation, characterization, optimization, immobilization and batch fermentation of bioflocculant produced by Bacillus aryabhattai strain PSK1 DOI: 10.1016/j.jgeb.2017.07.002 -
confidence 1.0
“t 29Si cm(cid:3)1 and MAS NMR spectroscopies, it can be concluded that the vibration at 538 for the Mg-OH group appeared clearly as d(Si-O-Si) synthesized Tx talc-like phyllosilicates presented flaws in their trans well as both vibrations a”
Functionalization of synthetic talc-like phyllosilicates by alkoxyorganosilane grafting DOI: 10.1039/C0JM01276A -
Metal oxygen confidence 1.0
“3d, the characteristic peak of 531.5447 Zn-O was observed at binding energy while the peak was observed at 538.48 eV may be attributed to the stearate48.”
Superhydrophobic magnetic sorbent via surface modification of banded iron formation for oily water treatment DOI: 10.1038/s41598-022-15187-6 -
confidence 1.0
“bands at 538 and 470 cm-1 The weak band from 800 occurs due to the symetric stretch vibrations of internal oxygen cm-1 bridges Si-O-Si.”
The Effect of Natural Clays Catalysts on Thermal Degradation of a Plastic Waste Mixture DOI: 10.4028/www.scientific.net/AEF.8-9.103
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