What absorbs at 762 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 762 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 762 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 |
|---|---|---|---|
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 0 | 0,9 |
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 |
|---|---|---|---|
| Cellulose | 762, 1735, 1650 | Methoxy (OCH3), Carbohydrate | 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 762 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
-
C-S single bond confianza 1,0
“Copolymer (aqueous) (cm-1) (cm-1) Functional group Wave number Functional group Wave number S bending 762 C S stretching 532 C”
Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738 -
Silicon (Si) confianza 1,0
“The peaks at 1139.24 cm-1 and 1095.99 cm-1 are assigned to stretching vibration of Si-O, the peaks at 1031.25 cm-1 and 1008.16 cm-1 are assigned to stretching vibration of Si(Al)-O, the peaks at 787.56 cm-1 and 761.71 cm-1 are assigned to s”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
confianza 1,0
“α-Phase are 762”
Abdullah 等 - 2014 - Effect of annealing process on the phase formation DOI: 10.1063/1.4895187 -
Alkyl C-H confianza 1,0
“Peaks at 762 and 721 cm-1 corresponded to out-of-plane symmetric deformations of the COOgroup and outof-plane C-H vibrations of bonded benzoate [47,48].”
Butova 等 - 2023 - In Situ FTIR Spectroscopy for Scanning Accessible DOI: 10.3390/nano13101675 -
confianza 1,0
“cm-1 absorption range was between 1100 to 400 and its characteristic absorption band at 951 is cm-1 cm-1 attributed to the Si-O group, while absorption band at 762 (Al-O group), 667 (Al-O-Al), 532, cm-1 and 459 (Si-O group) (Anton Beran, 20”
Fawzy - 2021 - Flotation separation of dravite from phlogopite us DOI: 10.37190/ppmp/138587 -
Acetate confianza 1,0
“1313.37 (C-N asymmetric bending), 1228.74 (C-O-C stretching), 1008.19 (C-O-C asymmetric stretching), 761.61 (Aromatic region in finger print).”
Kumar 等 - 2018 - Identification of Degradant Products of Saroglitaz DOI: 10.5530/ijper.52.4.74 -
Carbohydrate confianza 1,0
“The temperature programs for Comparison between commercial cellulose (CC) and 25∘ C dynamic tests were run from ambient temperature cellulose fiber (CF) shows that both celluloses have identical 700∘ 762cm-1 C.”
Liew 等 - 2015 - Synthesis and Characterization of Cellulose from G DOI: 10.1155/2015/212158 -
C c single bond confianza 1,0
“LLM confirmed rule peak-group candidate”
Miranda Sechi 和 Marques - 2017 - Preparation and Physicochemical, Structural and Mo DOI: 10.1590/1980-5373-MR-2016-1008
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