What absorbs at 887 cm⁻¹ in an FTIR spectrum?
Et bånd nær 887 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.
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Raskt svar
A band near 887 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 0.7 |
| N h | 1 | 0 | 1.0 |
Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.
Mulige materialer
| Materiale | Støttetopper | Overlappende grupper | Siterte kilder |
|---|---|---|---|
| gelatin | 887, 1652, 3300 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| sodium alginate | 887, 1636, 1080 | Hydroxyl (O-H), Alkyl C-H | 1 |
| TiO2 | 887, 1700, 1093 | Hydroxyl (O-H), Alkyl C-H | 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 887 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
-
Alkene (C=C) konfidens 1.0
“A sharp peak near 887 is assigned to C=CH out of plane bending and is derived from 2”
Chen 等 - 2019 - Baltic amber or Burmese amber FTIR studies on amb DOI: 10.1016/j.saa.2019.117270 -
Alkyl C-H konfidens 1.0
“( C-H) δ δ ( 1457 1375 In the amber samples a wide absorption shoulder in the ( C-O) 887 2) δ 2852 CH ( δ cm-1, region between 1255 and 1156 related to C-O stretch1645”
Differentiation between copal and amber by their structure and thermal behaviour DOI: 10.1007/s10973-023-12333-8 -
Alkyl C-H konfidens 1.0
“This assignment is supported by the fact that the 838 be consumed to oxidize contaminating hydrocarbons at the TiO 2 cm-1 and 887 bands in Figure 5, assigned to the OO stretching surface, as indicated by the decreases in the CH-stretching b”
Nakamura 等 - 2003 - In situ FTIR studies of primary intermediates of p DOI: 10.1021/ja029503q -
Hydroxyl (O-H) konfidens 1.0
“In addition to this, GP10, GP11 and GP13 also cm-1, showed new peaks around 887 which may be due to the deformation vibration of O-H, while the formation of hydrogen bonds in O-H may be due to the Maillard reaction or the glycosylation of g”
Characterization and Application in Packaging Grease of Gelatin–Sodium Alginate Edible Films Cross-Linked by Pullulan DOI: 10.3390/polym14153199 -
C c single bond konfidens 1.0
“1715, 1646 and which are attribcm-1 887 uted to C = H stretching, C-C stretching, and = CH out-ofare believed to be dependent on the degree of”
Amber, beads and social interaction in the Late Prehistory of the Iberian Peninsula: an update DOI: 10.1007/s12520-017-0549-7 -
Water (H2O) konfidens 1.0
“cm-1 cm-1, both DFO-B applications, the increased maxima at 1637 and 3342 assigned to as the intensive agarose peaks at 1370cm-1, 1037 cm-1, 928 cm-1, 887 cm-1 and 768 cm-1 were hydroxyls, are probably due to the water absorbed during the a”
Desferrioxamine B: Investigating the Efficacy of Hydrogels and Ethanol Gels for Removing Akaganeite and Maghemite from Dry Wooden Substrates DOI: 10.3390/f14020247 -
konfidens 0.9
“Text: 'stretching vibration bands of Mo-O-Mo are observed at 887, 830, 893, and 832'.”
Lakhlifi 等 - 2022 - Purple nanometrics pigments based on cobalt-doped DOI: 10.1016/j.molstruc.2021.131458 -
konfidens 0.9
“Explicit assignment: 'at 935 and 887 to' (bending vibrations from context)”
Diamonds in the rough: identification of naphthenic acids in oil sands waste and degraded crude oils DOI: 10.1080/14786419.2018.1428599
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