What absorbs at 927 cm⁻¹ in an FTIR spectrum?
A band near 927 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
Brzi odgovor
A band near 927 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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 0 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| PMMA | 927, 1722, 1383 | C-O single bond | 1 |
| starch | 927, 1650, 1540 | C-O single bond | 1 |
| polypropylene | 927, 1030, 1600 | C-O single bond | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
Logika spektra
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 927 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Hydroxyl (O-H) pouzdanost 1,0
“might also be a characteristic of pyranose moiety, with multi-chain peaks related to sequential groups.[22]The cm-1 arrangement of hydroxyl peak at 927 corresponds to C-H out-of-plane A deformations of trans-disubstituted ethylene groupings”
Lee 等 - 2015 - ATR-FTIR and Spectrometric Methods for the Assay o DOI: 10.1080/10942912.2014.923911 -
Acetate pouzdanost 1,0
“Pre-proof cm-1 The band at 927 was associated with stretching C-O in C-O-C group and vibration of α-1,4 glycosidic linkage [42], exhibiting the characteristic of the hydrophilic index of starch.”
Ratnaningsih 等 - 2020 - Physicochemical properties, in vitro starch digest DOI: 10.1016/j.ijbiomac.2019.09.092 -
Carbohydrate pouzdanost 1,0
“While, the bands at 927 and 862 notcausedestructionofstarchcrystals.Thus,preservation are related to the vibration of the glucose molecule [45, of crystalline structure may occur due to the protective 46].”
Roa Acosta 等 - 2020 - Structural and thermal properties of the amaranth DOI: 10.1515/ijfe-2020-0024 -
pouzdanost 1,0
“Tb3?-doped tributed particles of both vibrations of Si-O-Si bonds appear as a peak at 927 samples with sheetcm-1 The bands at 880-1020”
Structural and optical properties of green emitting Y2SiO5:Tb3+ and Gd2SiO5:Tb3+ nanoparticles for modern lighting applications DOI: 10.1007/s12598-020-01585-0 -
pouzdanost 1,0
“cm-1, IR spectra of OPC and clinker, showing medium intense broad peaks at 927 and 931 respectively, might be occurred from asymmetric stretching vibrations of Si-O-Si in SiO4 tetrahedra Vibrational frequencies of studied samples and their”
Micro-characterization of Dust and Materials of Dust Origin at a Cement Industry Located in Bangladesh DOI: 10.4209/aaqr.220109 -
Ketone pouzdanost 1,0
“group at 1277 and 1190 cm-1, the aromatic hydrogen in-plane deformation at 1155, 1215 and 1105 cm-1, and the aromatic hydrogen's out of plane bending modes occurred at 765, 860-841 cm-1 (broad band) and diphenyl ketone band at 927 cm-1.”
Mechano-Chemical Properties of Electron Beam Irradiated Polyetheretherketone DOI: 10.3390/polym14153067 -
Ammonium pouzdanost 1,0
“At 334 °C, new peaks appearing at 927 cm-1 and 965 cm-1 are attributed to NH3 absorptions, illustrating the decomposition of APP.”
The Effects of a Macromolecular Charring Agent with Gas Phase and Condense Phase Synergistic Flame Retardant Capability on the Properties of PP/IFR Composites DOI: 10.3390/ma11010111 -
Alkene (C=C) pouzdanost 0,9
“Explicit assignment: C=C bending in AESO.”
Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754
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