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
Ateb cyflym
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.
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| 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 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Deunyddiau posibl
| Deunydd | Copaon ategol | Grwpiau sy＇n gorgyffwrdd | Ffynonellau a ddyfynnwyd |
|---|---|---|---|
| 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 |
Mae deunyddiau＇n cael eu dangos dim ond pan fydd yr un gronfa lenyddiaeth yn cefnogi＇r band hwn ac o leiaf un brig nodweddiadol ychwanegol.
Rhesymeg sbectrwm
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.
Defnydd yn y byd go iawn
Mae＇r math hwn o ymholiad yn gyffredin mewn adnabod polymer, sgrinio plastig anhysbys, datrys problemau QC, dilysu deunydd wedi＇i ailgylchu, ac adolygiad o aseiniad copa wedi＇i gefnogi gan lenyddiaeth.
Camgymeriadau cyffredin
- Trin un band ynysig fel prawf o ddeunydd heb wirio o leiaf un neu ddau gopa cefnogol.
- Anwybyddu gorgyffwrdd: gall grwpiau swyddogaethol lluosog gyfrannu ger yr un rhif ton.
- Hepgor dilysu pan fo ychwanegion, cymysgeddau, ocsideiddio, neu halogiad yn gallu ystumio＇r sbectrwm.
Cyngor dilysu
Pan fo amwysedd yn parhau, dilyswch y rhagdybiaeth gyda DSC, GC-MS, neu TGA, yn enwedig ar gyfer cymysgeddau, samplau dirywiedig, a pholymerau llawn.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
-
Water (H2O) hyder 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 -
hyder 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 -
hyder 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) hyder 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) hyder 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
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.