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
Stutt svar
A band near 631 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.
Mögulegar úthlutun virkra hópa
| Virkur hópur | Stuðningsstaðreyndir | Tilvitnuð heimildir | Mesta öryggi |
|---|---|---|---|
| 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 |
Röðun endurspeglar uppsöfnuð ritrýnisgögn, ekki eina valdboðsreglu. Staðfestu alltaf í samhengi við sýnið þitt.
Möguleg efni
| Efni | Stuðningstindar | Skarast hópar | Tilvitnuð heimildir |
|---|---|---|---|
| PVA | 631, 1660, 2930 | Hydroxyl (O-H), Amide | 1 |
| starch | 631, 1650, 1540 | Hydroxyl (O-H), Amide | 1 |
| glycerol | 631, 1585, 1630 | Hydroxyl (O-H) | 1 |
| polycaprolactone | 631, 1580, 1751 | Amide | 1 |
| apatite | 631, 3053, 1640 | Phosphate (PO4), Phosphorus, Amide | 1 |
Efni birtast aðeins þegar sama bókmenntasafn styður þessa band og að minnsta kosti einn viðbótar einkennandi hámark.
Rófrök
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 631 cm⁻¹ is usually not enough for material identification by itself.
Raunveruleg notkun
Þessi tegund fyrirspurna er algeng við auðkenningu fjölliða, skimun óþekktra plasttegunda, bilanaleit í gæðaeftirliti, staðfestingu endurunnins efnis og bókmenntabakkaða endurskoðun á hápunktum.
Algeng mistök
- Meðhöndla eina einangraða öldulengd sem sönnun á efni án þess að athuga að minnsta kosti einn eða tvo stuðningstoppa.
- Hunsa skörun: mörg virkir hópar geta lagt sitt af mörkum nálægt sömu bylgjutölunni.
- Að sleppa staðfestingu þegar aukefni, blöndur, oxun eða mengun geta brenglað litrófið.
Staðfestingarráðgjöf
Þegar tvíræðni er eftir, staðfestu tilgátuna með DSC, GC-MS eða TGA, sérstaklega fyrir blöndur, niðurbrotin sýni og fylltar fjölliður.
Ritlist á bak við þessar úthlutanir
-
Hydroxyl (O-H) öryggi 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) öryggi 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) öryggi 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 öryggi 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) öryggi 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) öryggi 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 öryggi 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
Ertu með róf með þessu bandi?
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