What absorbs at 2550 cm⁻¹ in an FTIR spectrum?
A band near 2550 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 2550 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.
可能性のある官能基アサイン
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Thiol | 7 | 5 | 1.0 |
| Hydroxyl (O-H) | 4 | 3 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
| S s | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Sulfur | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
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Possible materials
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 2550 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.
これらのアサインの根拠となる文献
-
Hydroxyl (O-H) 信頼度 1.0
“There is no evidence of O-H stretching at 2550”
Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method DOI: 10.1016/j.spmi.2016.11.069 -
Hydroxyl (O-H) 信頼度 1.0
“There is no evidence of O-H stretching at nanostructured thin films with Mn-doping contents: (a) 2550cm-1 1650-1750cm-1, and O-H about suggesting that 1at% and (b) 3at%.”
Kharroubi 等 - 2012 - Mn doping effect on the structural properties of Z DOI: 10.1088/0031-8949/86/01/015805 -
信頼度 1.0
“Then, the removal of the isolated hydroxyls on the including a wavelength of 580-2000 nm, the intensities of the cm-1 Fe peaks at 2550 and 2650 were decreased, but these were 2O under the light (200-2000 nm) irradiation was 3 remained after”
Tanaka 等 - 2005 - FT-IR study on behavior of surface hydroxyls under DOI: 10.13182/FST05-A917 -
信頼度 1.0
“The weak bands cm-1 at 2550, 1716-1710, and 1595-1510 are associated with the stretching vibrations of cm-1 diverse amino acid residues [52,53].”
New Insights into the Medieval Hispano-Muslim Panel Painting: The Alfarje Found in a Balearic Casal (Spain) DOI: 10.3390/molecules28031235 -
Thiol 信頼度 1.0
“On the cm-1 other hand, the absence of the strong S-H stretching vibration of L-Cys at around 2550 in CAE-AgNPs”
Bioinspired 5-caffeoylquinic acid capped silver nanoparticles using Coffee arabica leaf extract for high-sensitive cysteine detection DOI: 10.1038/s41598-023-34944-9 -
Phosphate (PO4) 信頼度 1.0
“The bands for N-H appear at 1625 and 3410 The absence of the band at cm-1 2550 pointed to a binding mode mostly through P-O-Fe bonds to the iron surface.”
Maranescu 等 - 2018 - The corrosion inhibitor behavior of iron in saline DOI: 10.1515/pac-2018-0513 -
Silicon hydride 信頼度 1.0
“According thesized by method 1, in the reaction with an equimolar to elemental analysis, potassium cyclotetrasiloxanolates amount of potassium hydroxide, displayed all bands characcm-1 ([KOH]/[silane]=1) (νCH 2), contain both water and etha”
Nowacka 等 - 2015 - Alkali-Metal-Directed Hydrolytic Condensation of 3 DOI: 10.1007/s12633-014-9249-4 -
S s 信頼度 1.0
“It is worth indicating that around Furthermore, the presence of the disulfide in 3DPDS-fa and 4DPDS-fa was confirmed 2% of the S-S bonds of 4DPDS-fa cleaved, as shown by the small peak located between 2550”
Trejo-Machin 等 - 2021 - Synthesis of Novel Benzoxazines Containing Sulfur DOI: 10.3390/polym13081262
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