What absorbs at 918 cm⁻¹ in an FTIR spectrum?
A band near 918 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
Snabbt svar
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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| 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 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Möjliga material
| Material | Stödjande toppar | Överlappande grupper | Citerade källor |
|---|---|---|---|
| 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 |
Material visas endast när samma litteraturpool stöder detta band och minst en ytterligare karakteristisk topp.
Spektrumlogik
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.
Användning i verkligheten
Denna typ av fråga är vanlig inom polymeridentifiering, screening av okänd plast, felsökning av kvalitetskontroll, verifiering av återvunnet material och litteraturstödd toppidentifieringsgranskning.
Vanliga misstag
- Behandla ett isolerat band som bevis på ett material utan att kontrollera minst en eller två stödjande toppar.
- Ignorerar överlapp: flera funktionella grupper kan bidra nära samma vågtal.
- Hoppa över validering när tillsatser, blandningar, oxidation eller föroreningar kan förvränga spektrat.
Verifieringsråd
När oklarhet kvarstår, validera hypotesen med DSC, GC-MS eller TGA, särskilt för blandningar, nedbrutna prover och fyllda polymerer.
Litteratur bakom dessa identifieringar
-
Alkyl C-H förtroende 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 förtroende 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 -
förtroende 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 förtroende 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 -
förtroende 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 förtroende 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 förtroende 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 förtroende 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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