What absorbs at 3486 cm⁻¹ in an FTIR spectrum?
A band near 3486 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 5 cited sources
Stutt svar
A band near 3486 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) | 3 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
Röðun endurspeglar uppsöfnuð ritrýnisgögn, ekki eina valdboðsreglu. Staðfestu alltaf í samhengi við sýnið þitt.
Möguleg efni
| Efni | Stuðningstindar | Skarast hópar | Tilvitnuð heimildir |
|---|---|---|---|
| Chitosan | 3486, 1650, 1655 | Hydroxyl (O-H) | 1 |
| polyimide | 3486, 1720, 1778 | Carboxyl (COOH) | 1 |
| starch | 3486, 1650, 1540 | Hydroxyl (O-H) | 1 |
| glycerol | 3486, 1585, 1630 | Hydroxyl (O-H), Carboxyl (COOH) | 1 |
| cotton | 3486, 1030, 1638 | Hydroxyl (O-H) | 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 3486 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
-
Water (H2O) öryggi 1,0
“3234cm-1 3486cm-1 to indicates the replacement of free water Anti-plasticization is well known with lower glycerol concenH.Liuetal./CarbohydratePolymers83 (2011) 1591-1597 1595 for(a)extrudedpurestarch,(b)PSat20and70◦Cand(c)G210at20and70◦C.”
Glycerol/starch/Na+-montmorillonite nanocomposites: A XRD, FTIR, DSC and 1H NMR study DOI: 10.1016/j.carbpol.2010.10.018 -
öryggi 1,0
“Text: 'The peaks at 3486 and 1602 represent N-H ODA.'”
Surface and structural changes in polyimide by 100 MeV Ag7+ ion irradiation DOI: 10.1016/j.surfcoat.2009.02.078 -
öryggi 1,0
“The FTIR spectra of the C_P_ApI sample in the cm-1 peak at 3486 indicate N-H stretching due to the presence of chitosan.”
Hydrothermal Synthesis of Chitosan and Tea Tree Oil on Plain and Satin Weave Cotton Fabrics DOI: 10.3390/ma15145034 -
Hydroxyl (O-H) öryggi 1,0
“The is due to asymmetrical stretching cm-1 3486 band due to hydroxyl groups of water molecules vibration of the -COOH group.”
Nabipour 和 Sadr - 2015 - Layered zinc hydroxide-ibuprofen nanohybrids synt DOI: 10.1080/17458080.2014.998301 -
Hydroxyl (O-H) öryggi 1,0
“449 BONDINGINCOMPOSITEPROPELLANTS cm-1, The frequency of the O-H stretching vibtrations of isocyanurate (3486 cm-1 cm-1) 3386 and 3255 and the N-H stretching vibrations in ammonium percm-1) chlorate (3137 changed.”
Uscumlic 等 - 2006 - Investigation of the interfacial bonding in compos DOI: 10.2298/JSC0605445U
Ertu með róf með þessu bandi?
Hladdu upp FTIR-rófinu þínu og fáðu fulla túlkunarskýrslu — toppúthlutun með tilvitnunum í ritrýni, bókasamsvörun og sönnunarkeðju með öryggismati — á nokkrum sekúndum.