What absorbs at 3495 cm⁻¹ in an FTIR spectrum?
Et bånd nær 3495 cm⁻¹ kan peke på flere funksjonelle grupper. Nedenfor er de mest sannsynlige tildelingene, rangert etter hvor mye publiserte bevis som støtter hver — hver enkelt sporbar til litteratur (DOI) og kryssvalidert mot våre 130 000+ referansespektre og kunnskapsgraf.
Backed by 8 cited sources
Raskt svar
A band near 3495 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.
Mulige funksjonelle gruppe-tilordninger
| Funksjonell gruppe | Støttende fakta | Siterte kilder | Toppkonfidens |
|---|---|---|---|
| Hydroxyl (O-H) | 8 | 8 | 1.0 |
| Protein random coil | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.
Mulige materialer
| Materiale | Støttetopper | Overlappende grupper | Siterte kilder |
|---|---|---|---|
| MWCNT | 3495, 2876, 1430 | Hydroxyl (O-H) | 1 |
| Chitosan-Based | 3495, 2924, 1743 | Hydroxyl (O-H) | 1 |
| Cellulose | 3495, 1735, 1650 | Hydroxyl (O-H), Carbohydrate | 1 |
| chitosan | 3495, 1650, 1655 | Hydroxyl (O-H) | 1 |
| CA | 3495, 1045, 1650 | Hydroxyl (O-H) | 1 |
| Bacterial Cellulose | 3495, 1050, 1631 | Hydroxyl (O-H) | 1 |
Materialer vises kun når samme litteraturbase støtter dette båndet og minst en annen karakteristisk topp.
Spektrum-logikk
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 3495 cm⁻¹ is usually not enough for material identification by itself.
Virkelig bruk
Denne typen forespørsel er vanlig i polymeridentifikasjon, screening av ukjent plast, feilsøking i kvalitetskontroll, verifisering av resirkulert materiale og litteraturstøttet gjennomgang av topptilordning.
Vanlige feil
- Behandle ett isolert bånd som bevis på et materiale uten å sjekke minst en eller to støttende topper.
- Ignorerer overlapping: flere funksjonelle grupper kan bidra nær samme bølgetall.
- Hopp over validering når tilsetningsstoffer, blandinger, oksidasjon eller forurensning kan forvrenge spekteret.
Verifiseringsråd
Når tvetydighet gjenstår, valider hypotesen med DSC, GC-MS eller TGA, spesielt for blandinger, nedbrutte prøver og fylte polymerer.
Litteratur bak disse tilordningene
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Hydroxyl (O-H) konfidens 1.0
“x=0.03 x=0.04 x=0.05 x=0.06 O-H stretching 3494.77 3496.70 3494.77 3492.85 3434.98 3454.27 3436.91 Functional group x=0.00 x=0.01 x=0.02 x=0.03 x=0.04 x=0.05 x=0.06 Functional group x=0.00 x=0.01 x=0.02 x=0.03 x=0.04 x=0.05 x=0.06 O-H stret”
Harsono 等 - 2017 - Paramagnetic Zn(1-x)MnxO (0.00≤x≤0.06) Nanopar DOI: 10.4313/TEEM.2017.18.1.46 -
Ring structure konfidens 1.0
“3292cm(cid:2)1 1445cm(cid:2)1 In addition, the IR spectral peaks at 1568 and The disappearance of three peaks at 3495, 3450 and due to ring stretching of TP also did not exhibit a series of changes after assigned to O-H stretching for CA mi”
Solid-state thermal behavior and stability studies of theophylline–citric acid cocrystals prepared by neat cogrinding or thermal treatment DOI: 10.1016/j.jssc.2012.04.010 -
N h konfidens 1.0
“The value of the of 3473 is accepted as the cm-1 with high pH were treated for a long time at room temperature mean value of (i) free NH band positions at 3495 offreeN-”
Rozenberg 和 Shoham - 2007 - FTIR spectra of solid poly-L-lysine in the stretch DOI: 10.1016/j.bpc.2006.07.008 -
Hydroxyl (O-H) konfidens 1.0
“The cm-1 3495 indicating OH stretching due to intradensely packed network of cellulose with thinner molecular hydrogen bonds confirms the absence fibers indicate that BC has more hydrogen-”
Akintunde 等 - 2022 - Bacterial Cellulose Production from agricultural R DOI: 10.1080/21655979.2022.2062970 -
Hydroxyl (O-H) konfidens 1.0
“cm-1 typical peak at 3745 assigned to isolated silanols (n(O-H)), whereas curcumin displayed a sharp peak at cm-1 cm-1 3495.1 and a broad peak at 3000-3550 indicating OH group vibrations without and with intermolecular hydrogen bonding, res”
Treatment of breast cancer in vivo by dual photodynamic and photothermal approaches with the aid of curcumin photosensitizer and magnetic nanoparticles DOI: 10.1038/s41598-020-78241-1 -
Hydroxyl (O-H) konfidens 1.0
“O-H (stretching of alcohols) band at 3495 The three sericin extracts in this study were found to”
Profiling of Silk Sericin from Cocoons of Three Southern African Wild Silk Moths with a Focus on Their Antimicrobial and Antioxidant Properties DOI: 10.3390/ma13245706 -
Hydroxyl (O-H) konfidens 1.0
“A broad band was observed at ~3495 It could be represented to the stretching frequency of Ni(OH) present in the hydrogen bonded hydroxyl groups.”
Ni(OH)2-decorated nitrogen doped MWCNT nanosheets as an efficient electrode for high performance supercapacitors DOI: 10.1038/s41598-019-42281-z -
Hydroxyl (O-H) konfidens 1.0
“The broad PEG after hydrolysis (1b C) cm-1 band appearing at 3495.09 corresponds to the associated -OH stretching vibrations of the X-ray diffraction (XRD)”
Shivashankar 和 Mandal - 2013 - Design and Evaluation of Chitosan-Based Novel pH-S DOI: 10.4314/tjpr.v12i2.4
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