What absorbs at 1311 cm⁻¹ in an FTIR spectrum?
A band near 1311 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 5 cited sources
Snabbt svar
A band near 1311 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 |
|---|---|---|---|
| Secondary amine | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| C n single bond | 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 |
|---|---|---|---|
| Chitosan | 1311, 1650, 1655 | Alkyl C-H, Amide, N h | 1 |
| polyurethane | 1311, 2270, 1700 | Alkyl C-H, N h, Amide | 1 |
| CaCO3 | 1311, 1141, 712 | Alkyl C-H | 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 1311 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
-
Amide förtroende 1,0
“The C-O-C 𝑐𝑚-1, stretching vibration appears at 1075.12 while the C-N stretches around 1311.35 𝑐𝑚-1 (Timotius et al., 2022).”
Timotius 等 - 2022 - The Study of Methylene Blue Loading into Chitosan- DOI: 10.14716/ijtech.v13i8.6133 -
Acetate förtroende 1,0
“Signals obtained at 1311 are assigned to C=O vibration in lignin and at 1361 associated to deformation of C-H group in cellulose and hemicellulose.”
Diego Mendez-Mejias 和 Moya - 2016 - Effects on density, shrinking, color changing and DOI: 10.18671/scifor.v44n112.03 -
C-O single bond förtroende 1,0
“Bands at ~1311 1370 and the C-OH (or C-CH) bending mode.”
2D Correlation Spectroscopy (2DCoS) Analysis of Temperature-Dependent FTIR-ATR Spectra in Branched Polyethyleneimine/TEMPO-Oxidized CelluloseNano-Fiber Xerogels DOI: 10.3390/polym13040528 -
förtroende 1,0
“A very sharp peaks at 1311 which refers to N-H stretching is observed due to 4+ the complexation with addition of NH 4NO between the NH ions from salt in the BPEs system.”
Shaffie 和 Khiar - 2018 - Characterization of Chitosan-starch Blend Based Bi DOI: 10.1063/1.5041232 -
Alkyl C-H förtroende 1,0
“The peaks at around 1311 cm-1 were due to the twisting mode of -CH2, while that at around 1360 cm-1 corresponded to the methylene groups wagging vibrations [3,12,18].”
Fabrication of Aliphatic Water-Soluble Polyurethane Composites with Silane Treated CaCO3 DOI: 10.3390/polym12040747
Har du ett spektrum med detta band?
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