What absorbs at 887 cm⁻¹ in an FTIR spectrum?
A band near 887 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
Stutt 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.
Mögulegar úthlutun virkra hópa
| Virkur hópur | Stuðningsstaðreyndir | Tilvitnuð heimildir | Mesta öryggi |
|---|---|---|---|
| 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 |
Röðun endurspeglar uppsöfnuð ritrýnisgögn, ekki eina valdboðsreglu. Staðfestu alltaf í samhengi við sýnið þitt.
Möguleg efni
| Efni | Stuðningstindar | Skarast hópar | Tilvitnuð heimildir |
|---|---|---|---|
| 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 |
Efni birtast aðeins þegar sama bókmenntasafn styður þessa band og að minnsta kosti einn viðbótar einkennandi hámark.
Rófrök
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.
Raunveruleg notkun
Þessi tegund fyrirspurna er algeng við auðkenningu fjölliða, skimun óþekktra plasttegunda, bilanaleit í gæðaeftirliti, staðfestingu endurunnins efnis og bókmenntabakkaða endurskoðun á hápunktum.
Algeng mistök
- Meðhöndla eina einangraða öldulengd sem sönnun á efni án þess að athuga að minnsta kosti einn eða tvo stuðningstoppa.
- Hunsa skörun: mörg virkir hópar geta lagt sitt af mörkum nálægt sömu bylgjutölunni.
- Að sleppa staðfestingu þegar aukefni, blöndur, oxun eða mengun geta brenglað litrófið.
Staðfestingarráðgjöf
Þegar tvíræðni er eftir, staðfestu tilgátuna með DSC, GC-MS eða TGA, sérstaklega fyrir blöndur, niðurbrotin sýni og fylltar fjölliður.
Ritlist á bak við þessar úthlutanir
-
Alkene (C=C) öryggi 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 öryggi 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 öryggi 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) öryggi 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 öryggi 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) öryggi 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 -
öryggi 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 -
öryggi 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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