What absorbs at 1329 cm⁻¹ in an FTIR spectrum?
A band near 1329 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 6 cited sources
Snabbt svar
A band near 1329 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 | 3 | 1,0 |
| Carboxyl (COOH) | 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 |
| N h | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 0,9 |
| Lignin | 1 | 0 | 0,8 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Möjliga material
| Material | Stödjande toppar | Överlappande grupper | Citerade källor |
|---|---|---|---|
| PVA | 1329, 1660, 2930 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 2 |
| polysaccharide | 1329, 1637, 1320 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
| silica | 1329, 1100, 1080 | Alkyl C-H, 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 1329 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
“Furthermore, three peaks in the region (1328.80, cm-1 1373.5 and 1420.45) are assigned to C-H and CH Bending.”
Abead 等 - 2023 - Study physical characteristics of Polyvinyl Alcoho DOI: 10.15764/pche.2014.02001. -
förtroende 1,0
“Absorption peaks at 1653, 1365 cm-1 organic layers onto silica was assessed by elemental analare attributed to the N-H band of the amine and 1329 cm-1 ysis and IR measurements.”
Grochowicz 等 - 2013 - Investigation of the thermal behavior of new silic DOI: 10.1007/s10973-012-2635-5 -
Alkyl C-H förtroende 1,0
“LLM confirmed rule peak-group candidate”
Development of functional pectin edible films with fillers obtained from red cabbage and beetroot DOI: 10.1111/ijfs.14886 -
Acetate förtroende 1,0
“The bands observed at 1401 and 1329 cm-1 were associated with C-O vibrations cm-1 carboxylic groups.”
Mucilage from Yellow Pitahaya (Selenicereus megalanthus)Fruit Peel: Extraction, Proximal Analysis, and Molecular Characterization DOI: 10.3390/molecules28020786 -
Alkyl C-H förtroende 1,0
“The peak found at 1379 cm-1, and 1329 cm-1 can be related to C-H's symmetric”
Characterisation of the Phenolic Profile of Acacia retinodes and Acacia mearnsii Flowers’ Extracts DOI: 10.3390/plants11111442 -
Phosphate (PO4) förtroende 0,9
“Explicit assignment: 'P=O peak at 1329-1331cm-1'.”
Mohamed Saat 和 Johan - 2014 - The surface structure and thermal properties of no DOI: 10.1155/2014/439839
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