What absorbs at 769 cm⁻¹ in an FTIR spectrum?
A band near 769 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
Snabbt svar
A band near 769 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 0,9 |
| N h | 1 | 1 | 0,9 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Möjliga material
| Material | Stödjande toppar | Överlappande grupper | Citerade källor |
|---|---|---|---|
| PEG | 769, 1650, 1342 | Hydroxyl (O-H) | 1 |
Material visas endast när samma litteraturpool stöder detta band och minst en ytterligare karakteristisk topp.
Spektrumlogik
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 769 cm⁻¹ is usually not enough for material identification by itself.
Användning i verkligheten
Denna typ av fråga är vanlig inom polymeridentifiering, screening av okänd plast, felsökning av kvalitetskontroll, verifiering av återvunnet material och litteraturstödd toppidentifieringsgranskning.
Vanliga misstag
- Behandla ett isolerat band som bevis på ett material utan att kontrollera minst en eller två stödjande toppar.
- Ignorerar överlapp: flera funktionella grupper kan bidra nära samma vågtal.
- Hoppa över validering när tillsatser, blandningar, oxidation eller föroreningar kan förvränga spektrat.
Verifieringsråd
När oklarhet kvarstår, validera hypotesen med DSC, GC-MS eller TGA, särskilt för blandningar, nedbrutna prover och fyllda polymerer.
Litteratur bakom dessa identifieringar
-
Hydroxyl (O-H) förtroende 1,0
“However, the cm-1 broad intense band at 3400-3419 in the sample showed the existence of -OH stretching vibration (hydroxyl / phenol) generated by the phenol group, which was confirmed by the presence of 768.55 cm-1 in the non-anneal sample.”
Fabiani 等 - 2020 - Green synthesis and characterization of Zinc Ferri DOI: 10.1088/1755-1315/599/1/012066 -
Alkyl C-H förtroende 1,0
“the wagging deformation band at 769 from C-H Additionally, 1,5-hexadiene was identified as a decomposition various vibrations of the hexene moiety, which were also Creative β-elimination) product (via a for all hb-FRs via the bands at obser”
Battig 等 - 2019 - Hyperbranched phosphorus flame retardants multifu DOI: 10.1039/c9py00737g -
Hydroxyl (O-H) förtroende 1,0
“cm-1 3678 [34,35] and O-H deformation at 765 and 769 The band occurred at 2860 due to 3678 cm-1 [34,35] and O-H deformation at 765 and 769 cm-1.”
Kumar 等 - 2020 - Polyethylene Glycol (PEG) Modified Porous Ca-5(PO4 DOI: 10.3390/coatings10060538 -
förtroende 1,0
“The stretching vibration characteristic peaks of the Fe-O bond in ferrate were obThe stretching vibration characteristic peaks of the Fe-O bond in ferrate were obtained cm-1, cm-1, cm-1 tained at around 700 cm-1, 769 cm-1, 879 cm-1 and conf”
Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt DOI: 10.3390/w13192619 -
Silicon (Si) förtroende 1,0
“The band at 769 was assigned to the Si-O symmetric cm-1 stretching or bending mode whereas the band at 947 was assigned to the Si-O stretching mode of non-bridging oxygen.”
Zaid 等 - 2017 - Effect of Sintering on Crystallization and Structu DOI: 10.2298/SOS1704409Z -
Metal oxygen förtroende 0,9
“Explicit assignment.”
Saliu 等 - 2017 - Catalytic crosslinking of a regenerated hydrophobi DOI: 10.1515/epoly-2016-0289 -
Phosphate (PO4) förtroende 0,9
“Text: '769 cm-1 stretching of C-OP bond'”
Yasmin 等 - 2022 - Biosorptive Potential of Pseudomonas species RY12 DOI: 10.1177/15593258221117352 -
förtroende 0,8
“Text: 'ν (ν ν (ν region accounts for the fundamental bands = 768.809'”
High resolution FTIR spectrum of CH2D79Br: the ground, v5 = 1 and v9 = 1 state constants DOI: 10.1080/00268970903567270
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