What absorbs at 2860 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2860 cm⁻¹ puede apuntar a varios grupos funcionales. A continuación se muestran las asignaciones más probables, clasificadas por cuánta evidencia publicada respalda cada una — cada una trazable a literatura (DOI) y validada de forma cruzada con nuestros más de 130,000 espectros de referencia y grafo de conocimiento.
Backed by 8 cited sources
Quick answer
A band near 2860 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.
Posibles asignaciones de grupos funcionales
| Grupo funcional | Hechos de respaldo | Fuentes citadas | Confianza máxima |
|---|---|---|---|
| Alkyl C-H | 42 | 39 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Methyl | 3 | 2 | 1,0 |
| Lignin | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
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 2860 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.
Literatura detrás de estas asignaciones
-
Alkyl C-H confianza 1,0
“cm-1 cm-1 cm-1 brations at 3639 cm-1 for -OH, 2860 cm-1 for -C-H, 2487 cm-1 for -C≡C-, 1625 cm-1 for -N-H, -C≡C-, vibrations at 3639 for -OH, 2860 for -C-H, 2487 for 1625 for cm-1 cm-1 cm-1 for -COOH, 1053 cm-1 for -C-F, and 530 cm-1 for Ca”
Biosynthesis and Characterization of Calcium Oxide Nanoparticles from Citrullus colocynthis Fruit Extracts; Their Biocompatibility and Bioactivities DOI: 10.3390/ma16072768 -
Alkyl C-H confianza 1,0
“Peaks at 2860 and 2929 are also formed, which cm-1 C-H OC-H we tentatively assign to the stretch of the group in the SOZ.”
McIntire 等 - 2009 - Secondary Ozonide Formation from the Ozone Oxidati DOI: 10.1021/jp901535t -
Alkyl C-H confianza 1,0
“-NH2 (C-N Stretching) 2935.05cm-1 ±2935cm-1 Alkane(C-HStretching) (Medium) cm-1 cm-1 cm-1 and 2611.01 >3000 (Medium) Alkane (C-H Stretching) 2715.39 2879.43cm-1 and2868.32cm-1 ±2860cm-1 Alkane(C-HStretching) (Medium)”
Validation of the Developed Zero-Order Infrared Spectrophotometry Method for Qualitative and Quantitative Analyses of Tranexamic Acid in Marketed Tablets DOI: 10.3390/molecules26226985 -
Alkyl C-H confianza 1,0
“2860cm-1 The C-H stretching bands observed at 2960, 2920 and”
Micelle based synthesis of cobalt ferrite nanoparticles and its characterization using Fourier Transform Infrared Transmission Spectrometry and Thermogravimetry DOI: 10.1016/j.matchemphys.2010.06.029 -
Alkyl C-H confianza 1,0
“cm(cid:2)1, C¼C 1740 weak signal of vibrations at about 1610 methyl cm(cid:2)1, C-O and methylene stretch at 2860 and 2920 respectively, and cm(cid:2)1 stretch at around 1230, 1160, and 1090 (Edwards and Farwell, 1996;”
Geographical variations and correlation among some chemical and thermal properties of Almaciga (Agathis philippinensis Warb.) resins from selected commercial sites in the Philippines DOI: 10.1016/j.heliyon.2021.e06413 -
Alkyl C-H confianza 1,0
“The (100) textured sheets contained two dominant peaks centred at 2860 cm(cid:1)1 cm(cid:1)1, and 2930 which correspond to the symmetric and asymmetric stretch bands of CH group.”
Titus 等 - 2005 - Quantitative analysis of hydrogen in chemical vapo DOI: 10.1016/j.diamond.2004.12.001 -
Hydroxyl (O-H) confianza 1,0
“2010 1570 28.6 33.8 24.8 cm(cid:1)1e3000 cm(cid:1)1 region exposure time, particularly in the 3700 Latitude: 3.11 cm(cid:1)1e2340 cm(cid:1)1 Longitude: 101.55 region (H- (NH, OH stretching) and the 2860 Altitude: 27 bonded COOH [54]).”
The durability of clear polyurethane coil coatings studied by FTIR peak fitting DOI: 10.1016/j.polymdegradstab.2012.12.003 -
confianza 1,0
“Most spectra of the embryo (Table 1) presented high peak intensities inthefunctionalgroupregion(1800-4000cm(cid:5)1),withpeaksat2860and cm(cid:5)1 2930 that are related to amino acids, fatty acids, lipids, proteins and peptides (Tables 2A a”
Modelling the vigour of maize seeds submitted to artificial accelerated ageing based on ATR-FTIR data and chemometric tools (PCA, HCA and PLS-DA) DOI: 10.1016/j.heliyon.2020.e03477
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