What absorbs at 857 cm⁻¹ in an FTIR spectrum?
A band near 857 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 857 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 |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Sulfate (SO4) | 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 |
| Carbohydrate | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Silicon carbon | 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 |
|---|---|---|---|
| lignin | 857, 1035, 1510 | Methacrylate, Methoxy (OCH3) | 2 |
| cellulose | 857, 1735, 1650 | Methacrylate, Methoxy (OCH3) | 1 |
| hemicelluloses | 857, 1735, 1270 | Methacrylate, Methoxy (OCH3) | 1 |
| silica | 857, 1100, 1080 | Methacrylate | 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 857 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
-
Silicon carbon förtroende 1,0
“LLM confirmed rule peak-group candidate”
Mhaisagar 等 - 2014 - Mechanical properties of surface modified silica l DOI: 10.1016/j.mee.2013.10.006 -
Metal oxygen förtroende 1,0
“The absorption band at 953 and is designated to the stretching 857cm-1 frequency of Sr-O bond and Si-O stretching frequency appears at in the prepared silicate materials is due to the asymmetric 969cm-1 stretching frequency of Si-O bond in”
Down-conversion characteristics of Eu3+ doped M2Y2Si2O9 (M = Ba, Ca, Mg and Sr) nanomaterials for innovative solar panels DOI: 10.1016/j.pnsc.2019.07.003 -
förtroende 1,0
“10 mA In the Ni 2p region, the peaks at 857.2 eV and 875.0 eV were assigned to Ni 2p3/2 and Ni 2p1/2, and the peaks at 862.5 eV and 880.4 eV 2.5.”
Ni(II)/Ni(III) redox couple endows Ni foam-supported Ni2P with excellent capability for direct ammonia oxidation DOI: 10.1016/j.cej.2020.126795 -
C c single bond förtroende 1,0
“C-C polysaccharides, for instance, glycosaminoglycans, more specifically identify the stretching mode of proline at 857 and ~931”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Metal oxygen förtroende 1,0
“LLM confirmed rule peak-group candidate”
Gao 等 - 2013 - Effect of silicic acid on arsenate and arsenite re DOI: 10.1016/j.apgeochem.2013.09.005. -
Alkyl C-H förtroende 1,0
“corresponding to aliphatic and aromatic -OH (3415 cm-1), aromatic ring modes (1595 cm-1 and 1140 cm-1), carbonyl group (1684 cm-1), aliphatic -CH3 (2944 cm-1) and CH2 groups (1453 cm-1), symmetric -CH3 stretching of the methoxyl groups (285”
Characterization and Evaluation of Hydrothermal Liquefaction Char from Alkali Lignin in Subcritical Temperatures DOI: 10.3390/ma14113024 -
Water (H2O) förtroende 1,0
“at 860.9 for and at 849.6 for When proton acceptor (PA) molecules of the water dimer at 3590.5 wateriscodepositedwithOCS,weattributethebandsat857.2 cm(cid:12) 1, and 3660.6 respectively, and these bands are attributed cm(cid:12)”
First infrared investigations of OCS–H 2 O, OCS–(H 2 O) 2 , and (OCS) 2 –H 2 O complexes isolated in solid neon: Highlighting the presence of two isomers for OCS–H 2 O DOI: 10.1063/1.4986403 -
Carbohydrate förtroende 1,0
“(Kotwaliwale et al., agriculture and food quality evaluation cm-1 the 857 band, assigned to pectin (Synytsya et al., 2003).”
From the Soft to the Hard: Changes in Microchemistry During Cell Wall Maturation of Walnut Shells DOI: 10.3389/fpls.2020.00466
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