What absorbs at 1258 cm⁻¹ in an FTIR spectrum?
A band near 1258 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 1258 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 |
|---|---|---|---|
| Alkyl C-H | 6 | 6 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Silicon carbon | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。
Possible materials
| 素材 | 補助ピーク | Overlapping groups | 引用元 |
|---|---|---|---|
| PET | 1258, 1408, 800 | Methacrylate, Alkyl C-H, C-O single bond | 1 |
| Polystyrene | 1258, 1020, 1600 | Alkyl C-H, Methacrylate, Amide | 1 |
| Polyethylene | 1258, 1737, 1720 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| collagen | 1258, 1408, 1660 | Amide, Methacrylate, Alkyl C-H | 1 |
| hydroxyapatite | 1258, 1620, 1639 | Alkyl C-H, Methacrylate, Amide | 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 1258 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
“1 showed the overall pattern of both spectra which indi1265cm(cid:3)1 cm(cid:3)1 addition, peaks around and 1258 were attributed cated the basis absorption of mid infrared for the raw material of C@O to bond of flavonoids, steroidal and tri”
Chen 等 - 2014 - Determination of chemical changes in Isatis indigo DOI: 10.1016/j.saa.2014.01.048 -
C c single bond 信頼度 1.0
“1074 stretching 1113 C-H wagging at benzoic ring C-N stretching in imidazole ring and C-C stretching between 1258”
Degradation of Losartan Potassium Highlighted by Correlated Studies of Photoluminescence, Infrared Absorption Spectroscopy and Dielectric Spectroscopy DOI: 10.3390/pharmaceutics14112419 -
Alkyl C-H 信頼度 1.0
“The comparison purpose , all the FTIR spectra in DHOA system was spectra of pure TBP in MeOH and ACN showed the phosphoryl cm-1, normalized with C-H bending at 1376 which do not shift cm-1, peak at 1258±1 which appeared very close to the ba”
Verma 等 - 2018 - Structural investigations on uranium(VI) and thori DOI: 10.1039/C7NJ04460G. -
Silicon carbon 信頼度 1.0
“and Si-CH deformation band at 1258 Similarly the intensity of those bands”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
Amide 信頼度 1.0
“X-ray scatis cm(cid:2)1 C-N bending vibration, the band centered at 1258 to the tering measurements suggest the self-assembling of disordered article cm(cid:2)1 C-O stretching vibration and the sharp band at 1077 to the Article.”
Design of a fluorescent and clickable Ag38(SRN3)24 nanocluster platform: synthesis, modeling and self-assembling DOI: 10.1039/d1na00090j -
Acetate 信頼度 1.0
“Comparative ATR/FTIR spectra recorded for (a) V1 modified with different metal fillers and (b) V2 modified with different metal fillers However, it should be noted that the addition of metal powders leads to a general change in the shape cm”
Caramitu 等 - 2022 - Physico-chemical Characterization of Paint Films w DOI: 10.37358/Mat.Plast.1964 -
N h 信頼度 1.0
“1258 This absorption band appears due to CC and CN stretching, NH bending and CH bending vibrations, but also OH deformation and CO stretching vibration interactions.”
Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes DOI: 10.3390/molecules28010318 -
Amide 信頼度 1.0
“cm-1 ν(CN) δ(NH) The vibrations at 1258 correspond to amide III, and are attributed to and from the”
Drobota 等 - 2020 - Preparation and Characterization of Electrospun Co DOI: 10.3390/ma13183961
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