What absorbs at 1339 cm⁻¹ in an FTIR spectrum?
A band near 1339 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
Hurtigt svar
A band near 1339 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 funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 0,8 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| Fe3O4 | 1339, 2358, 1673 | Alkyl C-H, N h | 1 |
| nanoparticles | 1339, 1732, 1647 | Alkyl C-H | 1 |
| Fe3O4 nanoparticles | 1339, 1673, 1470 | Alkyl C-H, N h | 1 |
| ZnO | 1339, 1400, 3430 | Alkyl C-H | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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 1339 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Acetate tillid 1,0
“The obtained data is in agreement with the Qingbo et al research on gastric cancer spectra, indicted the band at 1457 cm-1 is symmetric and asymmetric CH3 bending of the methyl groups of lipid, protein, nucleic cm-1 acid, respectively, and”
Ghassemi 等 - 2021 - Diagnosis of normal and malignant human gastric ti DOI: 10.1016/j.molstruc.2020.129493 -
Alkyl C-H tillid 1,0
“1380-1200 1380-1200 1380-1200 1380-1200 CH wagging [36-40] 2 Collagen CH vibration 1339”
Detection of Human Cholangiocarcinoma Markers in Serum Using Infrared Spectroscopy DOI: 10.3390/cancers13205109 -
Phospholipid tillid 1,0
“(PO2-) 1458 and 1396 The phosphodiester groups arise lipids arises at 1462 cm-1, cm-1,1174 cm-1 cm-1, 1233 and 1079 which from phospholipids bands at 1339”
Toxicity mechanism of Cu2+ ion individually and in combination with Zn2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis DOI: 10.1007/s10867-020-09560-7 -
Alkyl C-H tillid 1,0
“cm-1 C-C and C-O stretching exhibited the peak at 1148 However, the peak at 1339 of the infrared wavenumbers indicated CH bending modes [61].”
Extraction and Characterization of Potential Biodegradable Materials Based on Dioscorea hispida Tubers DOI: 10.3390/polym13040584 -
Amide tillid 1,0
“The bands in 1339 and 1596 were due to the C-N and R-NH bonds, respectively.”
Silveira 等 - 2021 - DOI: 10.1590/0366-69132021673833101 -
tillid 1,0
“Thus, the kinetic analysis was carried out only considering by much more intensified signals of surface-adsorbed species: the plasma CO hydrogenation in the presence of ZnO and 2 cm-1 the peaks at 1339 and 1304 are assigned to the adsorbed”
Sun 等 - 2022 - Plasma-Catalytic CO2 Hydrogenation over a PdZnO C DOI: 10.1021/jacsau.2c00028 -
Alkyl C-H tillid 1,0
“cm-1), cm-1), cm-1) (1778 esters (1730 and the C-H, =CHbanding group (1339 were cm-1) cm-1) and C-H vinyl group (3013-3016 cm-1) were identified in stage b.”
Wzorek 等 - 2021 - Thermal Decomposition of Olive-Mill Byproducts A DOI: 10.3390/en14144123 -
Protein alpha helix tillid 0,8
“Text mentions 'bands (1339 and 1317) ... α-helix'.”
Thermally induced gluten modification observed with rheology and spectroscopies DOI: 10.1016/j.ijbiomac.2021.01.008
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