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
Hiter odgovor
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.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| 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 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| 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 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en dodatni karakteristični vrh.
Logika spektra
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.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
-
Amide zaupanje 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 zaupanje 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 zaupanje 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 -
zaupanje 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 zaupanje 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
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