What absorbs at 754 cm⁻¹ in an FTIR spectrum?
A band near 754 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
Snel antwoord
A band near 754 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.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| Alkyl C-H | 4 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Methyl | 1 | 0 | 1,0 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Mogelijke materialen
| Materiaal | Ondersteunende pieken | Overlappende groepen | Geciteerde bronnen |
|---|---|---|---|
| TiO2 | 754, 1700, 1093 | Alkyl C-H | 1 |
| Fe3O4 | 754, 2358, 1673 | Alkyl C-H, N h | 1 |
| PMMA | 754, 1722, 1383 | Alkyl C-H | 1 |
| PANI | 754, 2930, 1300 | Alkyl C-H, Secondary amine, N h | 1 |
Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.
Spectrumlogica
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 754 cm⁻¹ is usually not enough for material identification by itself.
Gebruik in de praktijk
Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.
Veelgemaakte fouten
- Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
- Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
- Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.
Advies voor verificatie
Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.
Literatuur achter deze toewijzingen
-
vertrouwen 1,0
“The peaks around 754 are related to the Zr-O stretching vibrations in ZrO 2.”
Photocatalytic activity of ZrO2/TiO2/Fe3O4 ternary nanocomposite for the degradation of naproxen: characterization and optimization using response surface methodology DOI: 10.1038/s41598-022-14676-y -
Amide vertrouwen 1,0
“cm-1 The bands located at 754 and 788-821 are assigned respectively to the stretching vibration of C-N band and”
Structural study of the effect of mineral additives on the transparency, stability, and aging of silicate gels DOI: 10.1007/s10971-020-05385-x -
Alkyl C-H vertrouwen 1,0
“https://doi.org/10.1371/journal.pone.0248465.g002 cm-1 spectral peak observed around 670 corresponds to C = C bending of disubstituted alkene cm-1 class and absorption peaks at 754 and 875 belong to disubstituted C-H bending.”
Characterization of thermal storage stability of waste plastic pyrolytic char modified asphalt binders with sulfur DOI: 10.1371/journal.pone.0248465 -
Silicon (Si) vertrouwen 1,0
“Absorption peaks appearing at cm-1 cm-1 754 and 844 are associated with bending vibration of Si-C.”
Li 等 - 2018 - Thermal insulation of silica aerogelPMMA composit DOI: 10.1515/secm-2017-0248 -
N h vertrouwen 1,0
“The most dismost distinctive bands for these compounds are observed at 1270 and 754 due to due to the stretchtinctive bands for these compounds are observed at 1270 and 754 cm-1 the stretching vibrations of the CN group and wagging vibratio”
TG-DSC and TG-FTIR Studies of Annelated Triazinylacetic Acid Ethyl Esters—Potential Anticancer Agents DOI: 10.3390/molecules28041735 -
N h vertrouwen 1,0
“The observation was further strengthened by 2 cm-1 the sharp absorption band at 754 in the spectrum of the ligand, due to NH deformation 2”
Osunniran 等 - 2020 - TOXICOLOGICAL ASSESSMENT OF SYNTHESIZED AND CHARAC DOI: 10.4314/bcse.v34i3.6 -
Alkyl C-H vertrouwen 1,0
“cm-1 occupied by asymmetric & symmetric vibration bands of the H-N C-H peak appears at 754”
Electrocatalytic performance of NiNH2BDC MOF based composites with rGO for methanol oxidation reaction DOI: 10.1038/s41598-021-92660-8 -
Alkyl C-H vertrouwen 1,0
“The absorption 2925cm-1 2854cm-1 754cm-1 mode, and the peak at peaks observed at and are due to is assigned to the wag asymmetric C-H and symmetric C-H stretching vibrations vibration of N-H, which is different in Figure 1(a).”
Zhu 等 - 2013 - Electrochemical Properties of PANI as Single Elect DOI: 10.1155/2013/940153
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