What absorbs at 631 cm⁻¹ in an FTIR spectrum?
A band near 631 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 7 cited sources
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 0,95 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Literatura por trás destas atribuições
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Hydroxyl (O-H) confiança 1,0
“3 cm-1, cm-1 The sharp narrow band at 630.92 634.47 and wide band at 3525.94 cm-1 are associated with the hydroxyl”
XRD and FTIR study of A&B type carbonated hydroxyapatite extracted from bovine bone DOI: 10.1063/1.5089399 -
Silicon (Si) confiança 1,0
“On the other hand, MMT nanoclays can be identified by stretching of Si-O-Si associated with bands of 631 cm-1 and 1075 cm-1 attributed to the bending of this group.”
Physical-Mechanical Behavior and Water-Barrier Properties of Biopolymers-Clay Nanocomposites DOI: 10.3390/molecules26216734 -
Phosphate (PO4) confiança 1,0
“There are two strong peaks due to the asymmetric ν4 bending mode of (PO4), a smaller peak at 631 cm-1 due to hycm-1 ν3 characteristic of phosphate groups at 1048 and 1087 attributed to asymmetric droxyl groups, a few weaker peaks due to car”
Archaeometric Investigations of the Chalcolithic Pottery from Topolița—Neamț County, Romania DOI: 10.3390/coatings13030488 -
Amide confiança 1,0
“Proteins, including the amide I peak at 1,631 cm-1, exhibit the strongest bands in the spectra depending on the secondary structure of the”
Macotpet 等 - 2020 - Attenuated total reflection Fourier transform infr DOI: 10.4142/jvs.2020.21.e16 -
Hydroxyl (O-H) confiança 1,0
“There is no evidence of any characteristic hydroxyl group vibrations (631 and 3572”
Mirkovic 等 - 2018 - Structural, Morphological and Electrical Propertie DOI: 10.2298/SOS1801095M -
Hydroxyl (O-H) confiança 1,0
“LLM confirmed rule peak-group candidate”
Characterization of PLA/PCL/Nano-Hydroxyapatite (nHA) Biocomposites Prepared via Cold Isostatic Pressing DOI: 10.3390/polym15030559 -
Metal oxygen confiança 0,95
“Explicit assignment: 'peak at 631cm-1 is attributed to the vibration of the Ti-O of anatase.'”
Sun 等 - 2006 - Preparation and gas-sensing property of a nanosize DOI: 10.1016/j.snb.2005.06.006
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