What absorbs at 3495 cm⁻¹ in an FTIR spectrum?
A band near 3495 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 8 cited sources
Rychlá odpověď
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.
Možná přiřazení funkčních skupin
| Funkční skupina | Podpůrná fakta | Citované zdroje | Nejvyšší spolehlivost |
|---|---|---|---|
| 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 |
Pořadí odráží nahromaděné literární důkazy, nikoli jediné autoritativní pravidlo. Vždy potvrďte v kontextu vašeho vzorku.
Možné materiály
| Materiál | Podpůrné píky | Překrývající se skupiny | Citované zdroje |
|---|---|---|---|
| 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 |
Materiály jsou zobrazeny pouze tehdy, když stejný literární soubor podporuje tento pás a alespoň jeden další charakteristický pík.
Logika spektra
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.
Reálné použití
Tento typ dotazu je běžný při identifikaci polymerů, screeningu neznámých plastů, řešení problémů s QC, ověřování recyklovaných materiálů a kontrole přiřazení píků podložené literaturou.
Běžné chyby
- Považování jednoho izolovaného pásu za důkaz materiálu bez kontroly alespoň jednoho nebo dvou podpůrných píků.
- Ignorování překryvu: více funkčních skupin může přispívat poblíž stejného vlnočtu.
- Přeskakování validace, když mohou aditiva, směsi, oxidace nebo kontaminace zkreslit spektrum.
Rady pro ověření
Pokud přetrvává nejednoznačnost, ověřte hypotézu pomocí DSC, GC-MS nebo TGA, zejména u směsí, degradovaných vzorků a plněných polymerů.
Literatura za těmito přiřazeními
-
Hydroxyl (O-H) spolehlivost 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 spolehlivost 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 spolehlivost 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) spolehlivost 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) spolehlivost 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) spolehlivost 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) spolehlivost 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) spolehlivost 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
Máte spektrum s tímto pásem?
Nahrajte své FTIR spektrum a získejte plnou interpretační zprávu – přiřazení píků s citacemi literatury, shody s knihovnou a řetězec důkazů s hodnocením spolehlivosti – během několika sekund.