What absorbs at 763 cm⁻¹ in an FTIR spectrum?
A band near 763 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 763 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Möjliga material
| Material | Stödjande toppar | Överlappande grupper | Citerade källor |
|---|---|---|---|
| graphene oxide | 763, 1150, 3400 | Methacrylate, Acetate, Alkyl C-H | 1 |
| chitosan | 763, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 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 763 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
-
Alkyl C-H förtroende 1,0
“The attachment of CTS-Si to HNT can be denoted by the C-H stretching ameter were 762.53 m2/g, 0.3154 cm3 g-1, 0.1911 nm3 g-1, and 6.10 nm, respectively.”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Acetate förtroende 1,0
“The vibration located at 3,313 is attributed to N-H stretching, the vibration cm-1 cm-1 located at 1,700 is attributed to C=O stretching, and the vibration located at 763 is attributed”
Nansen 等 - 2010 - Using Spatial Structure Analysis of Hyperspectral DOI: 10.3390/rs2040908 -
Acetate förtroende 1,0
“The bands from 763 to corresponded to the C-O bond stretching.”
Xu 等 - 2005 - Chitosan-starch composite film preparation and ch DOI: 10.1016/j.indcrop.2004.03.002 -
förtroende 1,0
“The Raman signal 311 cm-1 is generated by Mg jumping at the tetrahedral position, and the signal 763 cm-1 is caused by the symmetric stretching vibration of Mg-O in the tetrahedral cell.”
Zhao 等 - 2022 - Gemological and Spectroscopic Characteristics of DOI: 10.3390/min12111359 -
Acetate förtroende 1,0
“In Figure 2A, ATR-FTIR spectra of the ARP gave characteristic peaks at to a reduction in the stretching vibrations of the ARP molecule due to its accumulation in cm-1 cm-1 cm-1 1672 (carbonyl peak), 1027 (for C-O-C stretch), as well as 763”
Awais 等 - 2023 - Enhanced Solubility and Stability of Aripiprazole DOI: 10.3390/molecules28093860 -
Alkyl C-H förtroende 1,0
“cm-1 The presence of the maximal 830 value is connected with bending vibrations of carboxylic cm-1 ions, while the band at 763 may be associated with rocking vibrations of -CH 2groups [38-45].”
Swelling of Hydrogels Based on Carboxymethylated Starch and Poly(Acrylic Acid): Nonlinear Rheological Approach DOI: 10.3390/polym12112564 -
Carbonyl (C=O) förtroende 1,0
“cm-1 cm-1 and 1244 are related to vibrational modes of the aromatic ring, while The bands around 1007 cm-1 cm-1 and 828 are due to the bending of the C=O bond and of the CH bond the bands at 763 cm-1 are likely due to respectively.”
Pace 等 - 2013 - An innovative photochemical facility at DA Phi NE- DOI: 10.1088/1742-6596/425/7/072024 -
Alkyl C-H förtroende 1,0
“It could be also noticed in Figure 1, the presence of cm-1 three intense absorption bands with peaks at 1072 corresponding to the stretching cm-1 vibrations Si-O, at 763 assigned to the bending vibrations of the C-H bond [16] and”
Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330
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