What absorbs at 899 cm⁻¹ in an FTIR spectrum?
A band near 899 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 899 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Metal oxygen | 2 | 2 | 0.9 |
| Phosphate (PO4) | 2 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 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 |
|---|---|---|---|
| Chitosan-Based | 899, 2924, 1743 | Methacrylate, Methoxy (OCH3), Alkyl C-H | 1 |
| ZnO | 899, 1400, 3430 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 1 |
| chitin | 899, 1650, 1655 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| hematite | 899, 1030, 469 | Hydroxyl (O-H) | 1 |
| kaolinite | 899, 3696, 693 | Hydroxyl (O-H) | 1 |
| ZnO nanoparticles | 899, 1219, 1726 | Hydroxyl (O-H), Alkyl C-H, 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 899 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
“1066 Isoindole deformation coupled with aza stretching 899 Isoindole asymmetry deformation coupled with aza C-H 725 wagging δ (-OH) ZnO 3432”
Gharagozlou 和 Naghibi - 2018 - Sensitization of ZnO nanoparticles by metal-free p DOI: 10.1016/j.jlumin.2017.12.020 -
confidence 1.0
“The strong band observed between Ti stretching vibration of 899.41cm-1 511.80cm-1 Santhoshkumar et al.”
Synthesis of titanium oxide nanoparticles using Aloe barbadensis mill and evaluation of its antibiofilm potential against Pseudomonas aeruginosa PAO1 DOI: 10.1016/j.jphotobiol.2019.111667 -
Phosphate (PO4) confidence 1.0
“The characteristic peaks of CS NPs cm-1 899 (P-O-P stretching).”
Chitosan-Based Anti-Oxidation Delivery Nano-Platform: Applications in the Encapsulation of DHA-Enriched Fish Oil DOI: 10.3390/md19080470 -
Acetate confidence 1.0
“cm-1 the results in the The peaks at 899, 1037, 1369, and 1649 are assigned to the characteristic of ß-glycosidic linkages, the C-O in cellulose, the O-H bending, and the bending mode of adsorbed water, respectively.”
Synthesis and characterization of Ag@AgCl-reinforced cellulose composites with enhanced antibacterial and photocatalytic degradation properties DOI: 10.1038/s41598-021-82447-2 -
Amide confidence 1.0
“likewise, at the end of the differentiation In addition to that, analyzing the second derivative of protocol we appreciated the presence of a new component at 1700cm-1 899cm-1 (Figure 4(b)), we the amide I band from 1600 to”
Jesus Vazquez-Zapien 等 - 2016 - FTIR Spectroscopic and Molecular Analysis during D DOI: 10.1155/2016/6709714 -
Hydroxyl (O-H) confidence 1.0
“cm-1 cm-1 (δO-H (γO-H at 899 bending vibration) and 798 bending vibration, overlapping with at 899 cm-1 (δO-H bending vibration) and 798 cm-1 (γO-H bending vibration, overlapping with quartz and silicate clay) [69-76].”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
Nucleic acid confidence 1.0
“cm-1) dientes a las vibraciones de extensión del esqueleto de dratos correspondiente al glucógeno (1068-1022 cm-1) cm-1 DNA (986 así como la banda espectral a 899 (Figura 5B), y región de ácidos nucleicos corresponcm-1) correspondiente a DN”
Mata-Miranda 等 - 2017 - DOI: 10.17488/RMIB.38.1.17 -
confidence 1.0
“cm-1, νC-N) at 1548-1538 amide III (νC-N and δN-H) micrograph of the calcium carbonate crystals, and the patcm-1 cm-1 at 1308 or characteristic intense bands at 899 tern, displayed in Fig.”
Nowacki 等 - 2020 - Electrochemical method for isolation of chitinous DOI: 10.1007/s00339-020-03533-2
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