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
Ātra atbilde
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| 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 |
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 927 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
-
Hydroxyl (O-H) pārliecība 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 pārliecība 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 pārliecība 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 -
pārliecība 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 -
pārliecība 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 pārliecība 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 pārliecība 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) pārliecība 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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