What absorbs at 1133 cm⁻¹ in an FTIR spectrum?
A band near 1133 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 5 cited sources
Kiire vastus
A band near 1133 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 |
|---|---|---|---|
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 0,8 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| PLLA | 1133, 1182, 921 | C-O single bond, Methoxy (OCH3), Methacrylate | 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 1133 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
-
Carboxyl (COOH) usaldusväärsus 1,0
“moiety incorporated through transesterification onto coir, but after curing this band disappears C cm-1 and weak band at 1133 appears due to benzoate (C 6H 5-COO-) vibration ensuring the C introduction of benzoate moiety after curing [Fig.1”
Rout 等 - 2017 - A green approach to produce silver nano particles DOI: 10.1016/j.surfin.2017.03.004 -
S eq o usaldusväärsus 1,0
“cm-1, amine at 3343.3 S=O stretching asymmetric band thermal behavior of rather the drug or polymer may cm-1 at 1133.4 and S=O stretching symmetric band indicate a possible drug-polymer interaction (9).”
Jelvehgari 等 - 2015 - Experimental Design to Predict Process Variables i DOI: 10.15171/apb.2015.033 -
Acetate usaldusväärsus 1,0
“New bands in CL-WE-AgNPs at 1133 and 1467 (Figure 5b) may be attributed as vibrations of the glycosidic C-O bond (C-O-C) stretches Polymers 2023, 15, x FOR PEER REVIEW 9 of 20”
Part B: Improvement of the Optical Properties of Cellulose Nanocrystals Reinforced Thermoplastic Starch Bio-Composite Films by Ex Situ Incorporation of Green Silver Nanoparticles from Chaetomorpha linum DOI: 10.3390/polym15092148 -
Acetate usaldusväärsus 1,0
“According to the band assignments in FTIR spectra, the 1182 cm-1 band is assigned to ν as(C-O-C) + r as(CH 3), and the bands at cm-1 1133 are the pure band relative to the CH group, r s(CH 3).”
Pandit 等 - 2014 - Influence of Temperature on the Conformational Gui DOI: 10.14429/dsj.64.7329 -
Amide usaldusväärsus 1,0
“The particular peak of 1133 results from the vibrations of the asymmetric stretching of the chemical bonds in C-N-C groups of the oxazine ring.”
A Phosphorous-Containing Bio-Based Furfurylamine Type Benzoxazine and Its Application in Bisphenol-A Type Benzoxazine Resins: Preparation, Thermal Properties and Flammability DOI: 10.3390/polym14081597
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.