What absorbs at 1291 cm⁻¹ in an FTIR spectrum?
A band near 1291 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
Ateb cyflym
A band near 1291 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.
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Amide | 4 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 0.9 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Deunyddiau posibl
| Deunydd | Copaon ategol | Grwpiau sy＇n gorgyffwrdd | Ffynonellau a ddyfynnwyd |
|---|---|---|---|
| PVP | 1291, 2983, 1648 | Methacrylate, Acetate | 1 |
| polyaniline | 1291, 1565, 1570 | Methacrylate, Acetate | 1 |
| copolymer | 1291, 2921, 1540 | Methacrylate, Acetate | 1 |
| PVDF | 1291, 1160, 840 | Methacrylate, Acetate | 1 |
| Fe2O3 | 1291, 1130, 1631 | Methacrylate, Acetate | 1 |
Mae deunyddiau＇n cael eu dangos dim ond pan fydd yr un gronfa lenyddiaeth yn cefnogi＇r band hwn ac o leiaf un brig nodweddiadol ychwanegol.
Rhesymeg sbectrwm
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 1291 cm⁻¹ is usually not enough for material identification by itself.
Defnydd yn y byd go iawn
Mae＇r math hwn o ymholiad yn gyffredin mewn adnabod polymer, sgrinio plastig anhysbys, datrys problemau QC, dilysu deunydd wedi＇i ailgylchu, ac adolygiad o aseiniad copa wedi＇i gefnogi gan lenyddiaeth.
Camgymeriadau cyffredin
- Trin un band ynysig fel prawf o ddeunydd heb wirio o leiaf un neu ddau gopa cefnogol.
- Anwybyddu gorgyffwrdd: gall grwpiau swyddogaethol lluosog gyfrannu ger yr un rhif ton.
- Hepgor dilysu pan fo ychwanegion, cymysgeddau, ocsideiddio, neu halogiad yn gallu ystumio＇r sbectrwm.
Cyngor dilysu
Pan fo amwysedd yn parhau, dilyswch y rhagdybiaeth gyda DSC, GC-MS, neu TGA, yn enwedig ar gyfer cymysgeddau, samplau dirywiedig, a pholymerau llawn.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
-
Acetate hyder 1.0
“Additional bands corresponding to C-O-H bending appeared at 1291 cm-1.”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Amide hyder 1.0
“Peak at 1291 which also confirms the self-doped structure of the copolycm-1 indicate C N stretching and C H and at 3214 mer as proposed in reaction 1.”
Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738 -
Amide hyder 1.0
“The peak at 1291 was due to C-N stretching vibration and this confirmed the presence of the amine group in pure in the memcm-1 brane matrix.”
Experimental and DFT studies on the structural and optical properties of chitosan/polyvinyl pyrrolidone/ZnS nanocomposites DOI: 10.1007/s00289-023-04700-0 -
Acetate hyder 1.0
“In addition, a of thermogram which had two melting shifting of the C-O vibration of BA at 1291.40 points at 157.0 and 188.8 °C, respectively, cm-1 to 1379.16 was proof of deprotonation in corresponding to the DES and SA melting”
Ainurofiq 等 - 2018 - Synthesis, characterization, and stability study o DOI: 10.1080/10837450 -
Acetate hyder 1.0
“In BA, the neutral carboxylic group (-COOH) had a strong carbonyl (C=O) with stretching at a peak of 1686.82 cm-1 and a weak carbonyl (C-O) stretching at 1291.40 cm-1.”
A Novel Desloratadine-Benzoic Acid Co-Amorphous Solid: Preparation, Characterization, and Stability Evaluation DOI: 10.3390/pharmaceutics10030085 -
Fluorine (C-F) hyder 1.0
“O nline 1300 1300 CF symmetric stretching and rocking 1291 [19] α PVDF 2 L ibrary”
Chipara 等 - 2020 - Spectroscopic investigations on PVDF-Fe2O3 nanocom DOI: 10.1002/app.48907 -
Acetate hyder 1.0
“The peaks at 1585-1500 cm-1 resulted from the C=C stretching vibrations of the aromatic ring cm-1 C=C at 1585-1500 resulted from the stretching vibrations of the aromatic ring while the peak at while the peak at 1291 cm-1 can be assigned to”
Kowalczuk - 2020 - FTIR Characterization of the Development of Antimi DOI: 10.3390/coatings10090818 -
Alkene (C=C) hyder 1.0
“The porphyrin peaks at 1494 cm-1 and 1291 cm-1 due to their C=C and C-N stretching can also be seen in the GO@AuNRs-TMePyP spectrum.”
Graphene Oxide-Gold Nanorods Nanocomposite-Porphyrin Conjugate as Promising Tool for Cancer Phototherapy Performance DOI: 10.3390/ph14121295
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.