What absorbs at 485 cm⁻¹ in an FTIR spectrum?
A band near 485 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 485 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 |
|---|---|---|---|
| Metal oxygen | 6 | 6 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Metal oxo | 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 |
|---|---|---|---|
| ZnO | 485, 1400, 3430 | Metal oxygen, Methacrylate, C-O single bond | 1 |
| ZnO nanoparticles | 485, 1219, 1726 | Methacrylate, Metal oxygen, C-O single bond | 1 |
| kaolinite | 485, 3696, 693 | Metal oxygen | 1 |
| silver nanoparticles (AgNPs) | 485, 1100, 1749 | Methacrylate | 1 |
| zinc oxide | 485, 1627, 1638 | Metal oxygen, Methacrylate, C-O single bond | 1 |
| ZnO NPs | 485, 1664, 875 | Metal oxygen, Methacrylate | 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 485 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
-
kumpiyansa 1.0
“The FTIR spectra results show (Figure 6) that the absorption peaks at cm-1 485, 519, and 633 are attributed to the Al-O structural vibration and are characteristic peaks of Al 2O 3, consistent with the standard infrared peaks of corundum [1”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
Metal oxygen kumpiyansa 1.0
“The peak at 485 corresponds to the bending vibration of V-O-V [20].”
Saravanakumar 等 - 2018 - Role of NaOH concentration on synthesis and charac DOI: 10.1063/1.5047993 -
Metal oxygen kumpiyansa 1.0
“Earlier workers have reported the presence of Table 3) which almost matched with the data recorded by cm-1 cm-1 Zn-O 400-500 theDebye-Scherrerprocess.Table4demonstratestherelation the band at 485 [58], 442 [59],”
Udhayan 等 - 2021 - Evaluation of Bioactive Potential of a Tragia invo DOI: 10.1007/s12668-021-00864-z -
Metal oxygen kumpiyansa 1.0
“Hence, the relative intensity of TiOH(948cm-1),Ti-O-Ti band(485cm-1)”
Wan 等 - 2006 - Structure and thermal properties of titanium dioxi DOI: 10.1007/s00289-006-0506-6 -
Metal oxygen kumpiyansa 1.0
“Zn-O stretching vibrations are shifted to 495 cm-1 from 485 cm-1 with the addition of Cu-O Peak at 485”
Successive Photocatalytic Degradation of Methylene Blue by ZnO, CuO and ZnO/CuO Synthesized from Coriandrum sativum Plant Extract via Green Synthesis Technique DOI: 10.3390/cryst13020281 -
Metal oxygen kumpiyansa 1.0
“2 cm-1 300 (cid:3)C a wide band at 400-500 with maximum at and 500 (cid:3)C almost a plateau in sample mass can be cm-1 about 485 specific to Cu-O vibrations [33] appears.”
Synthesis of anisotropic Cu2-xS-based nanostructures by thermal oxidation DOI: 10.1007/s10973-019-08622-w -
Acetate kumpiyansa 1.0
“501 νCdO νC-O available, by comparing the position of the bands with charactercoordinates, and the stretching mode, respec485 502 tively.41,73,77 istic bands of similar molecules.”
Lopes 等 - 2011 - Photochemistry and Vibrational Spectra of Matrix-I DOI: 10.1021/jp110705c -
Acetate kumpiyansa 1.0
“C-O-C likeamines,phenols,alcohols,saponins,carboxylic acids, gave rise to the peak at 485 Antifungal and cytotoxic activities of AgNPs Fourier-transform Si-AgNPs.”
Rizwana 等 - 2022 - Biosynthesis and characterization of silver nanopa DOI: 10.1515/gps-2022-0048
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