What absorbs at 2887 cm⁻¹ in an FTIR spectrum?

Raskt svar

A band near 2887 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

Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.

Mulige materialer

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 2887 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

• Alkyl C-H konfidens 1.0

  “cm´1, for the OH group of pure PHB appears between 3200 and 4000 but the broad band of the OH The stretching peaks at 1452, 1379, 1223, and 2887 cm-1 correspond to the methyl group.”

  Influence of Electrospinning Parameters on Fiber Diameter and Mechanical Properties of Poly(3-Hydroxybutyrate) (PHB) and Polyanilines (PANI) Blends DOI: 10.3390/polym8030097
• Carbohydrate konfidens 1.0

  “4000 3500 3000 2500 2000 1500 1000 stronger hydrogen bonding could be concluded from the double (cm-1) Wave Number 2919cm-1 2887cm-1 999cm-1 992cm-1 peaks at to and to in nanocomposites samples when compared with pure starch (Ding, Ainswort”

  Glycerol/starch/Na+-montmorillonite nanocomposites: A XRD, FTIR, DSC and 1H NMR study DOI: 10.1016/j.carbpol.2010.10.018
• Alkyl C-H konfidens 1.0

  “Instead, the large cm-1 vibration band located at 2887 and corresponding to the C-H stretching from the aliphatic chain showed a decrease in intensity during laser irradiation.”

  Spectroscopic Characterization of Emulsions Generated with a New Laser-Assisted Device DOI: 10.3390/molecules25071729
• Hydroxyl (O-H) konfidens 1.0

  “The H-O-H stretching vibrations of a collection of water molecules engaged in crystallization are restretching vibrations of a collection of water molecules engaged in crystallization are stretching vibrations of a collection of water molec”

  Synthesis and Characterization of New Composite Materials Based on Magnesium Phosphate Cement for Fluoride Retention DOI: 10.3390/ma16020718
• Alkyl C-H konfidens 0.8

  “Intense spectra in group 2887-2925 attributed to CH2/CH3.”

  Potato Starch Utilization in Ecological Loose-Fill Packaging Materials—Sustainability and Characterization DOI: 10.3390/ma13061390
• Alkyl C-H konfidens 0.7

  “Context: C-H stretching at three frequencies.”

  Alghamdi 等 - 2021 - Effects of various media on micellization, adsorpt DOI: 10.1098/rsos.211527