What absorbs at 474 cm⁻¹ in an FTIR spectrum?
A band near 474 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
Quick answer
A band near 474 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.
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| N n bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Methacrylate | 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 |
| Acetate | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| S s | 1 | 1 | 0,9 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Spectrum logic
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 474 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura por trás destas atribuições
-
Sulfate (SO4) confiança 1,0
“The results of the calorimetric study of bands observed at 474 and 434 are assigned to ν ν Cs 4(AsO 4) and 2(SO 4) [20, 21].”
Mtioui 等 - 2015 - Thermal behavior and dielectric and vibrational st DOI: 10.1007/s11581-014-1196-y -
Metal oxygen confiança 1,0
“In contrast 0.0 cm-1, to untreated TiO, a strong peak at 1300 -80 -60 -40 -20 0 20 assignable to the Ti-O stretching vibrations, peak at Zeta Potential (mV) cm-1, assignable to the C=O stretching vibrations, 474 3: Zeta potential of TiO nan”
Singh 等 - 2016 - FT-IR and Zeta Potential Measurements on TiO Nanop DOI: 10.1063/1.4948233 -
N n bond confiança 1,0
“The sample x = 100 wt % - - n n = = 1 1 (MCZMFO) exhibits the two prominent vibration bands at and , 474 .”
Synthesis and characterization of (100-x) Ba0.82Sr0.03Ca0.15Zr0.10Ti0.90O3 + (x) Mg0.25Cu0.25Zn0.5Mn0.05Fe1.95O4 composites with improved magnetoelectric voltage coefficient DOI: 10.1016/j.jallcom.2017.11.066 -
Carbonyl (C=O) confiança 1,0
“The higher peak intensities of (cm-1) 474 methyl esterified stretching vibration of carbonyl group (C=O) at ~1740 in commercial pectin”
Evaluation of structural integrity and functionality of commercial pectin based edible films incorporated with corn flour, beetroot, orange peel, muesli and rice flour DOI: 10.1016/j.foodhyd.2019.01.022 -
Metal oxygen confiança 1,0
“LLM confirmed rule peak-group candidate”
Structurally enriched aliovalent Cd2+-doped SnO2 nanocrystals and their physicochemical investigations DOI: 10.1007/s10854-021-06217-6 -
Phosphate (PO4) confiança 1,0
“Two PO bending modes at 569.6 and bands were attributed to the 4(PO 4) modes .The 473.9cm-1 toν bands observed around were attributed 2(PO 4) modes.”
Wang 等 - 2005 - Nanostructure properties of hydroxyapatite nanobel DOI: 10.4028/www.scientific.net/KEM.288-289.187 -
confiança 1,0
“tions near 780 and 800 Si-O asymmetric bending from an overlapping of characteristic peaks for each cm-1 vibrations at 474 and symmetric vibrations of the one of the involved minerals in the infrared and Raman cm-1.”
Delgado Robles 等 - 2015 - Non-destructive in situ spectroscopic analysis of DOI: 10.1186/s40494-015-0048-z -
Protein confiança 1,0
“An additional peak at 474 has α-Se these particles also melt with electronic impact even been attributed to the protein vibration which is mixed with then the hollow sphere would not be produced because amorphous Se.”
Husen 和 Siddiqi - 2014 - Plants and microbes assisted selenium nanoparticle DOI: 10.1186/s12951-014-0028-6
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