What absorbs at 478 cm⁻¹ in an FTIR spectrum?
A band near 478 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 478 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 | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Metal oxo | 2 | 2 | 0,8 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 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 |
|---|---|---|---|
| calcium carbonate | 478, 3232, 2954 | Alkyl C-H, Silicon-oxygen (Si-O) | 1 |
| SiO2 | 478, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Metal oxygen | 1 |
| hematite | 478, 1030, 469 | Silicon-oxygen (Si-O), Metal oxygen | 1 |
| goethite | 478, 1470, 696 | Metal oxygen, Silicon-oxygen (Si-O) | 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 478 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
-
förtroende 1,0
“Energy dispersive X-ray structures of hematite moved the peak ranges from 478 (EDX) analyses showed a lot of potassium (0.384-4.057%) cm-1 cm-1 to 456 and 574 to 530 (Kosmas et al.”
An integrated toolkit using multiple methods for determining the potential sources of iron and manganese in groundwater: a case study from the lower Kelantan River Basin, Malaysia DOI: 10.1007/s12665-021-09756-7 -
förtroende 1,0
“The FTIR spectrum of the mulation with a size that matched the optical microscopy PVA-UHMWPEO/Ag@SiO nanocomposite exhibited several images, where the size of Ag cores was calculated to be 2 cm-1 new absorption peaks, such as 478 of (Si-O)”
Al-Bermany 等 - 2023 - Effect of green synthesis bimetallic Ag@SiO2 core- DOI: 10.1007/s12633-023-02332-7 -
förtroende 1,0
“The high-frequency mode at 579 and the peak at 478 can be attributed to cm-1, the Cu-O stretching vibration.”
Structural and UV-blocking properties of carboxymethyl cellulose sodium/CuO nanocomposite films DOI: 10.1038/s41598-023-28032-1 -
Silicon-oxygen (Si-O) förtroende 1,0
“In BB5, in addition to the characteristic features of haematite (Fe 2O 3) at 568 and 478 cm-1, the vibrational absorption of quartz (SiO 2), usually occuring in red ochre mixed with haematite, at 797, 781, and 693 cm-1 [49,50], was also App”
The 20th Century Wall Paintings in the Chapel of the Fallen in Parma Cathedral (Italy): Scientific Investigations for a Correct Conservation Project DOI: 10.3390/app13127235 -
Alkyl C-H förtroende 1,0
“Small cm-1 bands between 478 and 648 are related to C-H vibration [31].”
Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes DOI: 10.3390/ma15010170 -
Metal oxygen förtroende 0,9
“Assigned to Fe-O.”
Hydrothermal synthesis and characterization of amp#x003B1;-Fe2O3 nanoparticles DOI: 10.1016/j.mssp.2012.12.029 -
Metal oxo förtroende 0,8
“V-O-V vibrational stretching bond”
Selvakumar 等 - 2022 - Antibacterial Efficacy of Phytosynthesized Multi-M DOI: 10.1155/2022/6506796 -
förtroende 0,7
“Band at 478 cm-1 recognized as octahedral metal stretching”
Kiswanto 等 - 2018 - Effect of Zinc on Crystal Structure and Magnetic P DOI: 10.1088/1757-899X/367/1/012001
Har du ett spektrum med detta band?
Ladda upp ditt FTIR-spektrum och få en fullständig tolkningsrapport – toppidentifieringar med litteraturhänvisningar, biblioteksmatchningar och en förtroendebedömd beviskedja – på sekunder.