What absorbs at 1294 cm⁻¹ in an FTIR spectrum?
A band near 1294 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
Ātra atbilde
A band near 1294 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Methacrylate | 7 | 5 | 1,0 |
| Acetate | 7 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 4 | 1,0 |
| C-O single bond | 5 | 4 | 1,0 |
| Amide | 3 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ketone | 2 | 1 | 1,0 |
| Ester | 2 | 1 | 1,0 |
| Carbonyl (C=O) | 2 | 1 | 1,0 |
| Carboxyl (COOH) | 2 | 1 | 1,0 |
| Secondary amine | 2 | 1 | 1,0 |
| C n single bond | 2 | 1 | 1,0 |
| Aromatic ring | 2 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 0,9 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| pMMA | 1294, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| TiO2 | 1294, 1700, 1093 | Methacrylate, Acetate, C-O single bond | 1 |
| PCL | 1294, 1751, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| cellulose | 1294, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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 1294 cm⁻¹ is usually not enough for material identification by itself.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
Acetate pārliecība 1,0
“In this work, this band is related to a complex vibration, caused by overtones and combinations cm-1 of 1294 and 1400 bands due to the interacting C-O stretching and in-plane COH bending”
Kondratenko 等 - 2020 - Thioglycolic Acid FTIR Spectra on Ag2S Quantum Dot DOI: 10.3390/ma13040909 -
S eq o pārliecība 1,0
“The bands at 1146 and 1294 cm-1 were recognized to be the stretching vibrations of S=O symmetric and S=O asymmetric, respectively.”
Preparation and Characterization of Polymer Membranes Impregnated with Carbon Nanotubes for Olive Mill Wastewater DOI: 10.3390/polym14030457 -
Aromatic ring pārliecība 1,0
“stretching of benzene and thiophene ring (C-C-C) band at 1562 combination band cm-1 at 1294 that includes the asymmetrical stretching of benzene ring a(C-C-C), sym-”
Aguilar-Rodriguez 等 - 2023 - Microanalytical Characterization of an Innovative DOI: 10.3390/molecules28020564 -
Acetate pārliecība 1,0
“C-O (ν a stretching band C-O) from 1294 cellulosechainsbymeansoftheairplasmatreatments.”
Alonso-Montemayor 等 - 2020 - Effect of cold air plasma on the morphology and th DOI: 10.24275/rmiq/Mat1510 -
Acetate pārliecība 1,0
“The band at 1294 was associated with the stretching vibrations of C-O, and C-C bonds poly(ε-caprolactone).”
Hejna 等 - 2020 - Reclaimed RubberPoly(epsilon-caprolactone) Blends DOI: 10.3390/polym12051204 -
C-O single bond pārliecība 1,0
“[87,94] PCL C-O/C-C stretching 1294 asymmetric C-O-C stretching 1240 asymmetric CH stretching”
Kravanja 和 Finsgar - 2021 - Analytical Techniques for the Characterization of DOI: 10.3390/biomedicines9121936 -
Metal oxygen pārliecība 1,0
“surface.59 3(cid:2) to NO by the oxygen on Cr 2O Based on the 3 cm(cid:2)1) frequencies of the peaks (1294 and 1500 and previous surfaces,25,32,58-60,62,63 studies of nitrate ions on metal oxide (A S 0/S Changes in absorption spectra = log”
Nishino 和 Finlayson-Pitts - 2012 - Thermal and photochemical reactions of NO2 on chro DOI: 10.1039/c2cp42292a -
Amide pārliecība 1,0
“at 718 (C=O bending), 1714 (C=O symmetric stretching), 1608, 1514, 1464, 1393 (C-C stretching of aromatic ring), 1393 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 1.00 (C-N stretching), 1294, 1025 (Ph-O-CH2), and 912 (oxirane (keV) ring) gave mo”
Rane 等 - 2014 - Synthesis and Characterization of Imide Containing DOI: 10.1155/2014/941793
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