What absorbs at 767 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 767 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 767 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 | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 0,7 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| polyurethanes | 767, 1740, 1728 | Methacrylate, Alkyl C-H | 1 |
| zeolite | 767, 1013, 1245 | Alkyl C-H | 1 |
| graphite | 767, 1640, 1326 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 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 767 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
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confianza 1,0
“The characteristic FTIR peak seen at 767 corresponded to Ca-O bond stretching 28,5553.”
Antibacterial and Antibiofilm Activity of Ficus carica-Mediated Calcium Oxide (CaONPs) Phyto-Nanoparticles DOI: 10.3390/molecules28145553 -
Alkyl C-H confianza 1,0
“α-Glycosidic O-H bond [19] 846/11,820 stretch C-H 767/13,038 stretch Pyran ring [16] 3600-3200/2778-3125”
Detection of dextran, maltodextrin and soluble starch in the adulterated Lycium barbarum polysaccharides (LBPs) using Fourier-transform infrared spectroscopy (FTIR) and machine learning models DOI: 10.1016/j.heliyon.2023.e17115 -
Metal hydroxyl confianza 1,0
“Text: 'bands produced by the Al-OH bond at 767'”
Lopez-Rodriguez 等 - 2023 - Dyeing with Hydrotalcite Hybrid Nanoclays and Disp DOI: 10.3390/ijms24010808 -
Alkyl C-H confianza 1,0
“around 767 cm-1, the band represents a C--H bond from the aromatic ring.”
Effects of Various Types of Expandable Graphite and Blackcurrant Pomace on the Properties of Viscoelastic Polyurethane Foams DOI: 10.3390/ma14071801 -
Alkyl C-H confianza 1,0
“Figure 4C shows the loading plots of the regression vector for m-cresol corresponding to the PLSR model together with the labelling of the most significant bands [767 cm-1, 777 cm-1 (C-H bending), 1134 cm-1, 1158 cm-1, 1158 cm-1 (C-O stretc”
Relationships in Gas Chromatography—Fourier Transform Infrared Spectroscopy—Comprehensive and Multilinear Analysis DOI: 10.3390/separations7020027 -
Acetate confianza 1,0
“1000(vs) 1042(vs) 1050(vs) R C-O-Pstretching(phosphateester) CHout-of-planedeformation 861(m) 830(w) 894(m) S NH2 wag(primaryamines) Si-Cstretch 767(m) 767(w) 772(w) T CHout-of-planedeformation”
Assessing the Aflatoxin B1 Adsorption Capacity between Biosorbents Using an In Vitro Multicompartmental Model Simulating the Dynamic Conditions in the Gastrointestinal Tract of Poultry DOI: 10.3390/toxins10110484 -
confianza 0,7
“absorption peaks in 767-795 range characteristic for silicophosphate network”
Structural and morphological characterization of Pr3+ and Er3+-containing SiO2–P2O5 sol–gel thin films DOI: 10.1016/j.matchemphys.2011.10.031 -
Protein confianza 0,7
“bands with peaks at 767 cm-1 belong to proteins”
Application of FTIR Spectroscopy to Detect Changes in Skeletal Muscle Composition Due to Obesity with Insulin Resistance and STZ-Induced Diabetes DOI: 10.3390/ijms232012498
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