What absorbs at 918 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 918 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 918 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 | 4 | 4 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Ring structure | 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.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| epoxy resin | 918, 905, 1100 | Alkyl C-H, C-O single bond, Oxygen heterocycle | 1 |
| quartz | 918, 800, 3053 | Alkyl C-H | 1 |
| silver nanoparticles | 918, 1636, 1631 | Alkyl C-H, C-O single bond | 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 918 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
“The bands at 1010 cm-1 UV-VIS-NIR Spectrophotometer was used to record the difand 918 are for the C-H bond vibrations [12].”
Priya 和 Sharma - 2018 - Organo lanthanide metal complexes for application DOI: 10.1007/s10854-017-7902-6 -
Oxygen heterocycle confianza 1,0
“1) of the resins, the ν/cm-1 bands observed at ˜ 918 and 1675 are assigned to the vibrations of the epoxy ring and aldehyde cm-1 groups, respectively.”
Sahmetlioglu 等 - 2006 - Synthesis and characterization of oligosalicylalde DOI: 10.2478/s11696-006-0012-1 -
confianza 1,0
“Interestingly, the presence of CTATVHL peptide or TGF-(cid:628)(cid:1005) (cid:381)(cid:374)(cid:367)(cid:455) cm-1), For PAH, it was noticed: N-H stretching vibration (3360 in the multilayered coating showed to be biocompatible but cm-1),”
Alginate-based hydrogels functionalised at the nanoscale using layer-by-layer assembly for potential cartilage repair DOI: 10.1039/c7bm00525c -
Alkyl C-H confianza 1,0
“However, bands at 2,929 2,918cm-1 C-H might be assigned to vibrations of and 1,575cm-1 corresalkanes.”
Iqbal 等 - 2020 - Green synthesis of silver nanoparticles from Valer DOI: 10.1515/gps-2020-0066 -
confianza 1,0
“The 1038 cm-1is assigned to stretching vibrations of Si-O, and bands at 918 cm-1 and 882 cm-1 cm-1”
Khodosova 等 - 2022 - Magnetic Nanosorbents Based on Bentonite and CoFe2 DOI: 10.3390/min12111474 -
Alkyl C-H confianza 1,0
“cm-1 configurations, as seen in sugars, such as glucose, fructose, A similar peak at 1718 was seen by Jalaja and James after cm-1 others.23 4.27 sucrose, and For example, the peak at 918 oxidizing sucrose using NaIO The peak intensities of”
Patil 和 Netravali - 2019 - Enhancing Strength of Wool Fiber Using a Soy Flour DOI: 10.1021/acsomega.9b00055 -
Alkyl C-H confianza 1,0
“918 are the bands of the C-H deformation oscillations (as mentioned”
Samborska 等 - 2018 - Membrane Processing in the Sustainable Production DOI: 10.3390/app8071082 -
Acetate confianza 1,0
“1080 C - O stretching 918 C - C stretching MAA:EA blends (80:20, 60:40, 50:50, 40:60, 20:80 wt %) are also shown in Figure 3(a - e).”
Siddaiah 等 - 2018 - DOI: 10.1590/1980-5373-MR-2017-0987
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