What absorbs at 751 cm⁻¹ in an FTIR spectrum?
A band near 751 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
Mabilis na sagot
A band near 751 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.
Mga posibleng pagtatalaga ng functional-group
| Grupong functional | Mga sumusuportang katotohanan | Mga nasiping sanggunian | Pinakamataas na kumpiyansa |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
Ang pagraranggo ay sumasalamin sa naipon na ebidensya ng literatura, hindi isang solong awtoritatibong tuntunin. Palaging kumpirmahin laban sa konteksto ng iyong sample.
Mga posibleng materyales
| Materyal | Sumusuportang mga peak | Mga overlapping na grupo | Mga nasiping sanggunian |
|---|---|---|---|
| PMMA | 751, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polyvinylpyrrolidone | 751, 1660, 1700 | Methacrylate, Acetate | 1 |
| nanocomposite | 751, 2921, 3300 | Methacrylate, Acetate, C-O single bond | 1 |
| polyvinyl alcohol | 751, 1141, 1640 | Methacrylate, Acetate | 1 |
Ang mga materyales ay ipinapakita lamang kapag ang parehong literatura pool ay sumusuporta sa banda na ito at hindi bababa sa isang karagdagang katangian na tuktok.
Logic ng spectrum
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 751 cm⁻¹ is usually not enough for material identification by itself.
Paggamit sa totoong mundo
Ang uri ng query na ito ay karaniwan sa pagtukoy ng polymer, screening ng hindi kilalang plastic, pag-troubleshoot ng QC, pag-verify ng recycled na materyal, at pagsusuri ng pagtatalaga ng peak na may suporta ng literatura.
Mga karaniwang pagkakamali
- Pagtrato sa isang nakahiwalay na banda bilang patunay ng isang materyal nang hindi sinusuri ang hindi bababa sa isa o dalawang sumusuportang peak.
- Hindi pinapansin ang overlap: maraming functional group ang maaaring mag-ambag malapit sa parehong wavenumber.
- Pag-laktaw sa pagpapatunay kapag ang mga additives, blends, oxidation, o contamination ay maaaring mag-distort ng spectrum.
Payo sa pagpapatunay
Kapag nananatili ang kalabuan, patunayan ang hypothesis gamit ang DSC, GC-MS, o TGA, lalo na para sa mga blend, degraded na sample, at filled polymers.
Literatura sa likod ng mga pagtatalagang ito
-
Acetate kumpiyansa 1.0
“≈815 al/C_O aliphatic/carbonyl group ratios CH out-of-plane peaks at and 751 As these regions for cutin isolated from”
Fossil cutin of Macroneuropteris scheuchzeri (Late Pennsylvanian seed fern, Canada) DOI: 10.1016/j.coal.2012.10.012 -
Metal oxygen kumpiyansa 1.0
“The bands cm-1 at 750.8, 796.4, 751.0, 795.3, 750.9 and 795.5 for S01, S02, S03, S04, S05, and S06 indicate the cm-1 stretching and bending of Al-O-OH [40].”
Unique Halloysite Nanotubes–Polyvinyl Alcohol– Polyvinylpyrrolidone Composite Complemented with Physico–Chemical Characterization DOI: 10.3390/polym9060207 -
C c single bond kumpiyansa 1.0
“The decrease in intensity with an increase of radiation dose from 409 to cm-1 570 kGy as observed in peaks at 751, 1141, 1239, and 1726 to a negative direction indicates the breaking of C-C, C-O-C, and C-C-O bonds [2].”
Prasad 和 Lal - 2023 - Spectroscopic Investigations of Optical Bandgap an DOI: 10.33263/BRIAC132.187 -
kumpiyansa 1.0
“The peaks at around 210 ◦C ◦C peaks at 751 and 767 are due to the decomposition of calcium carbonate and release of CO2.”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Bromine kumpiyansa 1.0
“It to weak stretch of alkyl-amine C-N at 1109 It was observed in 25R-NBOH groups a degree of similarity was also observed strong absorption at a range of 751 to cm-1 with 25R-NBOMe, however, it was observed, as in Raman 756 due to Ar-R (R =”
Lucena 等 - 2022 - The Use of Single Crystal X-Ray Diffraction Techni DOI: 10.21577/0103-5053.20220130 -
Metal oxygen kumpiyansa 0.9
“Assigned to m-ZrO2 νZr-O mode”
Acidity-Reactivity Relationships in Catalytic Esterification over Ammonium Sulfate-Derived Sulfated Zirconia DOI: 10.3390/catal7070204 -
kumpiyansa 0.8
“Attributed to MoS2.”
Synthesis of Molybdenum Sulfide/Tellurium Hetero-Composite by a Simple One-Pot Hydrothermal Technique for High-Performance Supercapacitor Electrode Material DOI: 10.3390/nano11092346 -
kumpiyansa 0.7
“band at 751 cm-1 assigned to ACH in propylene unit”
Nanocomposites based on silica-reinforced ethylene⠍propylene⠍diene⠍monomer/acrylonitrile⠍butadiene rubber blends DOI: 10.1016/j.compositesb.2011.02.008
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