What absorbs at 928 cm⁻¹ in an FTIR spectrum?
A band near 928 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 928 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 |
|---|---|---|---|
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| cellulose | 928, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| hemicellulose | 928, 1730, 897 | Alkyl C-H, Methacrylate, Acetate | 1 |
| SiO2 | 928, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 1 |
| lignin | 928, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| biomass | 928, 1082, 1282 | Alkyl C-H, Methacrylate, Acetate | 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 928 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
“The peak at 927.80 indicates vibrations from C-O stretching”
Mahardiani 等 - 2022 - Nanofiber Fabrication from Palm Fiber Waste for Su DOI: 10.48317/IMIST.PRSM/morjchem-v10i2.32648 -
Alkyl C-H pārliecība 1,0
“The peak located at 928 manufacturers in the tequila region of Amatitán, cm-1 was due to the bending of the C-H bond of the Jalisco, Mexico.”
Mondragon-Cortez 等 - 2022 - Application of Fourier transform infrared spectros DOI: 10.24275/rmiq/Alim2806 -
Alkyl C-H pārliecība 1,0
“The XRD spectrum of Agr shows a peak 19.1◦ ∼ 2θ 1556.6 cm-1 and 1404.6 cm-1, N-H out of plane wagging at 608.8 cm-1, and C-H stretching at 928.2 at with the intensity of 1624 (a.u), which demonstrates the semi-crystalline nature of ∼ at 2θ”
Development of Biodegradable Agar-Agar/Gelatin-Based Superabsorbent Hydrogel as an Efficient Moisture-Retaining Agent DOI: 10.3390/biom10060939 -
Acetate pārliecība 1,0
“Similarly, the C-O stretching at 928 C-H stretching at can replace calcium in body.”
Dubey 等 - 2022 - Investigation of Hazardous Materials in Firecracke DOI: 10.14429/dsj.72.17836 -
Amide pārliecība 1,0
“C-OstretchingandC-OHbending polysaccharides(e.g.,glucose) PO32968 DNAandRNAribose stretching DNAandRNAribose-phosphatechain C-N+-Cstretching 928”
Fourier-Transform Infrared Spectroscopy as a Discriminatory Tool for Myotonic Dystrophy Type 1 Metabolism: A Pilot Study DOI: 10.3390/ijerph18073800 -
Water (H2O) pārliecība 1,0
“cm-1 cm-1, both DFO-B applications, the increased maxima at 1637 and 3342 assigned to as the intensive agarose peaks at 1370cm-1, 1037 cm-1, 928 cm-1, 887 cm-1 and 768 cm-1 were hydroxyls, are probably due to the water absorbed during the a”
Desferrioxamine B: Investigating the Efficacy of Hydrogels and Ethanol Gels for Removing Akaganeite and Maghemite from Dry Wooden Substrates DOI: 10.3390/f14020247 -
Silanol (Si-OH) pārliecība 1,0
“Indeed, the decay processes of atomic Figure sity of Si-OH and H-OH peaks located at wavenumbers → → oxygen such as O + O + N O +N or O + O + surface O around 928 cm-1 and 3400 cm-1.”
Atmospheric Plasma-Enhanced Spatial Chemical Vapor Deposition of SiO 2 Using Trivinylmethoxysilane and Oxygen Plasma DOI: 10.1021/acs.chemmater.0c01148 -
Alkyl C-H pārliecība 1,0
“C-H vibration of aldehyde group C=O 1671 in conjugated carbonyl group Furfural C=C 1465 stretching of furan ring 1276/1021 C-O stretching vibration 928/884/755 C-H bending out of plane peaks”
Zhuang 等 - 2020 - Observation of Potential Contaminants in Processed DOI: 10.3390/app10124345
Vai jums ir spektrs ar šo joslu?
Augšupielādējiet savu FTIR spektru un dažu sekunžu laikā iegūstiet pilnu interpretācijas ziņojumu — maksimumu piešķīrumus ar literatūras atsaucēm, bibliotēku saskaņošanu un pārliecības līmeņa pierādījumu ķēdi.