What absorbs at 1251 cm⁻¹ in an FTIR spectrum?
Et bånd nær 1251 cm⁻¹ kan peke på flere funksjonelle grupper. Nedenfor er de mest sannsynlige tildelingene, rangert etter hvor mye publiserte bevis som støtter hver — hver enkelt sporbar til litteratur (DOI) og kryssvalidert mot våre 130 000+ referansespektre og kunnskapsgraf.
Backed by 8 cited sources
Raskt svar
A band near 1251 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.
Mulige funksjonelle gruppe-tilordninger
| Funksjonell gruppe | Støttende fakta | Siterte kilder | Toppkonfidens |
|---|---|---|---|
| Methacrylate | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Amide | 3 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 0.8 |
| Phosphorus | 1 | 0 | 1.0 |
| Nitrogen heterocycle | 1 | 0 | 0.9 |
Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.
Mulige materialer
| Materiale | Støttetopper | Overlappende grupper | Siterte kilder |
|---|---|---|---|
| PVA | 1251, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| Fe3O4 | 1251, 2358, 1673 | Methacrylate, Acetate | 1 |
| ZnS | 1251, 1650, 1116 | Acetate, Methacrylate | 1 |
| Fe3O4 nanoparticles | 1251, 1673, 1470 | Methacrylate, Acetate | 1 |
Materialer vises kun når samme litteraturbase støtter dette båndet og minst en annen karakteristisk topp.
Spektrum-logikk
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 1251 cm⁻¹ is usually not enough for material identification by itself.
Virkelig bruk
Denne typen forespørsel er vanlig i polymeridentifikasjon, screening av ukjent plast, feilsøking i kvalitetskontroll, verifisering av resirkulert materiale og litteraturstøttet gjennomgang av topptilordning.
Vanlige feil
- Behandle ett isolert bånd som bevis på et materiale uten å sjekke minst en eller to støttende topper.
- Ignorerer overlapping: flere funksjonelle grupper kan bidra nær samme bølgetall.
- Hopp over validering når tilsetningsstoffer, blandinger, oksidasjon eller forurensning kan forvrenge spekteret.
Verifiseringsråd
Når tvetydighet gjenstår, valider hypotesen med DSC, GC-MS eller TGA, spesielt for blandinger, nedbrutte prøver og fylte polymerer.
Litteratur bak disse tilordningene
-
konfidens 1.0
“The moderate cm-1 belongs to N-H stretching absorption peak at 1251”
In-doped ZnS nanoparticles: structural, morphological, optical and antibacterial properties DOI: 10.1007/s00339-021-04425-9 -
Borate konfidens 1.0
“cm-1 *1251 The band centered at is attributed to B-O The resulted IR data were used in this research in order to stretching vibrations in [BO 3] units from boroxol cm-1”
Rada 等 - 2009 - Structural and electronic properties of tellurite DOI: 10.1007/s10853-009-3433-8 -
Acetate konfidens 1.0
“cm-1 C-O stretching 1251 cm-1”
Influence of Polyvinyl Alcohol (PVA) on PVA-Poly-N-hydroxyethyl-aspartamide (PVA-PHEA) Microcrystalline Solid Dispersion Films DOI: 10.1208/s12249-020-01811-z -
Oxygen heterocycle konfidens 1.0
“For spectrum, the main peaks located at 1251 and 877 LENR cm-1 are assigned for symmetric and asymmetric stretching of epoxide ring, respectively.”
Azhar 等 - 2017 - Epoxidation and Hydroxylation of Liquid Natural Ru DOI: 10.17576/jsm-2017-4603-17 -
Amide konfidens 1.0
“resents another alternative by accurately quantifying ligand The maximum amide peaking at 1653, 1546 and 1251 cm-1 density, but such techniques require matrix digestion [50].”
Boulet-Audet 等 - 2015 - Cleaning-in-place of immunoaffinity resins monitor DOI: 10.1007/s00216-015-8871-3) -
Acetate konfidens 1.0
“the C-O-C peaks of the ester bond at 1251 and cm-1 1024 also confirm this.”
Synthesis and Application of Tackifying Dispersant Poly (Vinyl Alcohol-Acrylic Acid-Triallyl Cyanate) DOI: 10.3390/polym14030557 -
Phosphate (PO4) konfidens 1.0
“Furthermore, an cm-1) ester bond in the FTIR spectra (C=O stretching at 1745 was selected for the estimation cm-1) of lipids and a phosphate functional group bond (P=O stretching at 1251 was selected for the estimation of polyphosphates.”
Calcium Affects Polyphosphate and Lipid Accumulation in Mucoromycota Fungi DOI: 10.3390/jof7040300 -
Acetate konfidens 1.0
“(b) (c) and The main vibrations, where the greatest changes in the wood occurred, were identified at the peaks at 1251 cm-1, which is related to the C-O stretching vibration;”
Moya 等 - 2022 - In Situ Synthesis of Fe3O4 Nanoparticles and Wood DOI: 10.3390/ma15093394
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