What absorbs at 1138 cm⁻¹ in an FTIR spectrum?
A band near 1138 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
Kiire vastus
A band near 1138 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.
Võimalikud funktsionaalrühmade määramised
| Funktsionaalrühm | Toetavad faktid | Tsiteeritud allikad | Kõrgeim usaldusväärsus |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Thiol | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| CeO2 | 1138, 1554, 1630 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| PEG | 1138, 1650, 1342 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
Materjale kuvatakse ainult siis, kui sama kirjanduse kogum toetab seda riba ja vähemalt ühte täiendavat iseloomulikku piiki.
Spektri loogika
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 1138 cm⁻¹ is usually not enough for material identification by itself.
Reaalse maailma kasutus
Seda tüüpi päring on tavaline polümeeri tuvastamisel, tundmatu plasti sõeluuringul, kvaliteedikontrolli probleemide lahendamisel, ringlussevõetud materjali kontrollimisel ja kirjandusel põhineval piirkinnituste ülevaatel.
Levinud vead
- Ühe isoleeritud riba käsitlemine materjali tõendina ilma vähemalt ühte või kahte toetavat piiki kontrollimata.
- Ülekattumise ignoreerimine: mitu funktsionaalrühma võivad anda panuse sama lainearvu lähedal.
- Valideerimise vahelejätmine, kui lisandid, segud, oksüdatsioon või saastumine võivad spektrit moonutada.
Kontrollimise nõuanne
Kui ebakindlus püsib, kinnitage hüpotees DSC, GC-MS või TGA abil, eriti segude, lagunenud proovide ja täidetud polümeeride puhul.
Nende määramiste taga olev kirjandus
-
Acetate usaldusväärsus 1,0
“cm-1 strong band at 792 Bands at 1138 and 610 are assigned to C-O and 2 3 m Ti-O, respectively.”
Errington 等 - 2010 - Synthesis and Structure of the Alkoxido-Titanium P DOI: 10.1007/s10876-010-0329-3 -
Amide usaldusväärsus 1,0
“*** II/COO(cid:3) Amide stretching 1188.83±0.08 1195.40±0.05 0.466±0.025 0.324±0.011 *** *** II/COO(cid:3) Amide stretching 1137.97±0.14 1141.26±0.12 0.649±0.012 0.275±0.010 II/COO(cid:3) Amide stretching 1065.34±0.23 1.084±0.012”
Differentiation in MALDI-TOF MS and FTIR spectra between two pathovars of Xanthomonas oryzae DOI: 10.1016/j.saa.2014.06.056 -
Acetate usaldusväärsus 1,0
“The ratio A/B also increases for all the 1297 associated with chain vibrations, and the cm-1 cm-1 films, treated as there exist more non-hydrogen-bonded bands at 1138 and 832 assigned to the asymunmodified C-O-C carbonyls, in comparison to”
Effect of PEG grafting density on surface properties of polyurethane substrata and the viability of osteoblast and fibroblast cells DOI: 10.1007/s10856-022-06668-1 -
Phosphate (PO4) usaldusväärsus 1,0
“12, the bands at 1138 and 1059 are P-O-C assigned to the stretching vibration of and PO 2/PO 3”
Functional group effect on flame retardancy, thermal, and mechanical properties of organophosphorus-based magnesium oxysulfate whiskers as a flame retardant in polypropylene DOI: 10.1039/c7ra02863f -
usaldusväärsus 1,0
“Moreover, the bands at 1009, 1122, and at 1138cm-1 region [21, 22], absorption peaks related to Er doping in were ascribed to stretching of Ti-O-C [17].”
Gokdemir 等 - 2014 - Structural Modification of Sol-Gel Synthesized V2O DOI: 10.1155/2014/795384 -
Hydroxyl (O-H) usaldusväärsus 1,0
“cm-1), cm-1), biomarkers were (~980 Oligosaccharide C-OH stretching band (~1138 IntegrativeBiologyAcceptedManuscript cm-1), cm-1), Deoxyribose (~1188 Amide III (~1242 In-plane CH bending vibration from the”
Jin 等 - 2017 - Fingerprinting microbiomes towards screening for m DOI: 10.1039/C7IB00009J. -
Thiol usaldusväärsus 1,0
“in the intensity of this band correlates with one of 1138 Thus, it is obviously that this band is associated with n(SH) coordinated H 2S.”
Martirosyan 等 - 2021 - Low Temperature Spectroscopic Study of the Sulfide DOI: 10.6060/mhc214035m -
usaldusväärsus 0,5
“From table 1, incomplete assignment”
Antioxidant and antidiabetic properties of biocompatible ceria oxide (CeO2) nanoparticles in mouse fibroblast NIH3T3 and insulin resistant HepG2 cells DOI: 10.1016/j.ceramint.2020.11.230
Kas teil on selle ribaga spekter?
Laadige üles oma FTIR spekter ja saage sekunditega täielik tõlgendusaruanne — piikide määramised kirjandusviidetega, raamatukogu vasted ja usaldusväärsusega hinnatud tõendite ahel.