What absorbs at 657 cm⁻¹ in an FTIR spectrum?
A band near 657 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 657 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 | 3 | 3 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Alkene (C=C) | 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 |
|---|---|---|---|
| TiO2 | 657, 1700, 1093 | Metal oxygen | 1 |
| TiO | 657, 1730, 1699 | Metal oxygen | 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 657 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 Raman peaks observed at 483 are attributed to the stretching mode vibration of Mn-O bonds, and another peak observed at cm-1 657 corresponds to A1g mode vibration of Mn 3O 4.”
Synthesis and characterization of Mn3O4/MnSnO3 nanocomposites for supercapacitor applications DOI: 10.1007/s12588-019-09250-7 -
Alkene (C=C) kumpiyansa 1.0
“The FTIR spectrum showed peaks at 1,592, 1,627 and 1,657 cm-1 assigned to C=C stretching of the imidazole ring and characteristic peaks at 1,605 and 1,766 assigned to C=O stretching.”
Synthesis, Characterization and Reactivity Ratio Study of Poly(di(tri-n-butyltin) citraconate-co-N-vinylimidazole) DOI: 10.3390/molecules15074750 -
kumpiyansa 1.0
“For this same 31, 39, and 46), thus exposing underneath layers, corresamples (showing a gypsum rich content) strong peaks late with the FTIR analysis of the samples, which indiascribed to lead white as well as a sharp peaks around cm-1 cate”
Cortea 等 - 2020 - Uncovering hidden jewels an investigation of the DOI: 10.1186/s40494-020-00401-3 -
Ring structure kumpiyansa 1.0
“The peaks cm-1 cm-1 occurring at 657 and 554 can be associated with the out of plane vibrations of ring structure and C-”
Okeke 等 - 2018 - Characterization of hibiscus sabdariffa fiber as p DOI: 10.1590/S1517-707620180004.0550 -
kumpiyansa 1.0
“Previous researchers have demonstrated that the peak around 657 is attributed 2 cm-1 to Ti-O-Ti stretching vibration, whereas the peak around 590 is due to the vibration of Ti-O-O.”
Physicochemical and Rheological Properties of a Transparent Asphalt Binder Modified with Nano-TiO2 DOI: 10.3390/nano10112152 -
Amide kumpiyansa 1.0
“cm-1 Other bands at 657.1 and 611.8 indicated an O=C-N bend of aliphatic secondary cm-1 amides [38].”
Adsorptive Performance of Walnut Shells Modified with Urea and Surfactant for Cationic Dye Removal DOI: 10.3390/w15081536 -
kumpiyansa 1.0
“In addition, the intense bands seen at 756 657 cm-1 and 489 ascribed to the Ti-O stretching vibration and confirmed the existence of TiO nanoparticles.”
UV-shielding properties of a cost-effective hybrid PMMA-based thin film coatings using TiO2 and ZnO nanoparticles: a comprehensive evaluation DOI: 10.1038/s41598-023-34120-z -
kumpiyansa 0.8
“Characteristic apatite signal”
Mirkovic 等 - 2018 - Structural, Morphological and Electrical Propertie DOI: 10.2298/SOS1801095M
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