What absorbs at 3335 cm⁻¹ in an FTIR spectrum?
A band near 3335 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 3335 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) | 9 | 9 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Urea | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Carbohydrate | 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 |
|---|---|---|---|
| polypropylene | 3335, 1030, 1600 | Methacrylate, Acetate, Hydroxyl (O-H) | 1 |
| LDPE | 3335, 1720, 1737 | Methacrylate, Acetate, 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 3335 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
“2), characterized by clear bands with a maximum of about 3335 corresponds to the stretching vibration of the -OH group of carbohydrates, water, and organic acids.”
Identification of sugars and phenolic compounds in honey powders with the use of GC–MS, FTIR spectroscopy, and X-ray diffraction DOI: 10.1038/s41598-020-73306-7 -
Chitosan spolehlivost 1,0
“Similar peaks were also found in chitosan (3361cm-1, 2867cm-1), (3335cm-1, 2895cm-1) (3299cm-1, 2922cm-1 peanut shell and skin powder”
Meng 等 - 2020 - Effects of peanut shell and skin extracts on the a DOI: 10.1016/j.ijbiomac.2020.02.235 -
Acetate spolehlivost 1,0
“In the present study, the cm(cid:1)1 symmetric NH2 CH3 stretching vibration is observed at 3335 in and CH group are not involved in the intermolecular hydrogen”
Growth, structure, Hirshfeld surface and spectroscopic properties of 2-amino-4-hydroxy-6-methylpyrimidinium-2,3-pyrazinedicorboxylate single crystal DOI: 10.1016/j.molstruc.2017.11.019 -
spolehlivost 1,0
“FTIR analysis of the degraded LDPE films gives a close view of N-H cm-1, stretching of aldehyde group at 3334.92 and 3228.84 cm-1, C-C=C symmetric of aromatic ring at 1639.49 C=O cm-1, stretching of aldehyde group at 1735.93 peak at N=O”
Gajendiran 等 - 2016 - Microbial degradation of low-density polyethylene DOI: 10.1007/s13205-016-0394-x -
Hydroxyl (O-H) spolehlivost 1,0
“A peak was observed at 3335 attributed to the hydroxyl (-OH) functional group.”
Experimental Study on the Application of Cellulosic Biopolymer for Enhanced Oil Recovery in Carbonate Cores under Harsh Conditions DOI: 10.3390/polym14214621 -
Silicon nitrogen spolehlivost 1,0
“Peaks observed at 1175, 2200, and 3335 cm-1 refer to with the Si-N stretching mode [25].”
Examination of the Hydrogen Incorporation into Radio Frequency-Sputtered Hydrogenated SiNx Thin Films DOI: 10.3390/coatings11010054 -
Acetate spolehlivost 1,0
“Figure 4b also shows a band at approximately 3335 cm-1, which may be associated with elongation in the HN-C=O group [71], confirming the presence of nitrogen detected in with elongation in the HN-C=O group [71], confirming the presence of n”
Simultaneous Treatment of Both Sides of the Polymer with a Conical-Shaped Atmospheric Pressure Plasma Jet DOI: 10.3390/polym15020461 -
Carboxyl (COOH) spolehlivost 1,0
“The weak but characteristic peaks observed at 1581 (sh), 1541 cm-1 (also stronger in sample D13) are indicative of the antisymmetric carboxylate vibration of metal salts [3335], possibly due to interactions between Pb2+ and Ca2+ (due to lea”
Identification of Colourants and Varnishes in a 14th Century Decorated Wood-Carved Door of the Dionysiou Monastery in Mount Athos DOI: 10.3390/coatings11091087
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.