What absorbs at 1343 cm⁻¹ in an FTIR spectrum?
A band near 1343 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
Quick answer
A band near 1343 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| C-O single bond | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 0,7 |
| Phospholipid | 1 | 1 | 0,7 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Possible materials
| Material | Vârfuri suport | Overlapping groups | Surse citate |
|---|---|---|---|
| rGO | 1343, 2358, 2930 | Methacrylate, Acetate, C-O single bond | 1 |
| PLA | 1343, 1650, 1073 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 1343 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura din spatele acestor atribuiri
-
Borate încredere 1,0
“The other peaks of pure bending vibrations at 1343 and 1360 (which indicates (O-B-O) LiDFOB salt (Fig.”
Polu 等 - 2015 - Poly(ethylene oxide)-lithium difluoro(oxalato)bora DOI: 10.1007/s11581-015-1474-3 -
Alkyl C-H încredere 1,0
“The peaks at 1343 and 1450 are attributed to CH from methylene group.”
Optimization of primary sewage sludge and coal lignite by microwave assisted pyrolysis for the production of bio oil DOI: 10.1080/09593330.2020.1797903 -
Hydroxyl (O-H) încredere 1,0
“Moreover, the peak cm-1 cm-1 at 1104 corresponds to the C-O stretching of the C-O-C bond and the peak at 1343 is due to cm-1 the O-H bending of the C-OH group.”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
Acetate încredere 1,0
“cm-1, The bands at vibration of C-O, shifted to 1343 and also an intense, broad band at 1281 belongs cm-1 1000-500 are due to vibrational modes of the to C-N functional group.”
Ebadi 等 - 2019 - Synthesis and properties of magnetic nanotheranost DOI: 10.2147/IJN.S214923 -
C-O single bond încredere 1,0
“cm-1 cm-1 cm-1 the absorption bands at 1343 to 1419 correspond to C-OH stretching, 2927 C-H absorption bands at 1343 cm-1 to 1419 cm-1 correspond to C-OH stretching, 2927 cm-1 C-H stretching, absorption bands at 1343 cm-1 to 1419 cm-1 corre”
Complex Permittivity and Electromagnetic Interference Shielding Effectiveness of OPEFB Fiber-Polylactic Acid Filled with Reduced Graphene Oxide DOI: 10.3390/ma13204602 -
Phosphate (PO4) încredere 1,0
“In organophosphorus layer deposited on iron surface, bands at 1343 and 1023 P=O cm-1, cm-1 cm-1 associated with and P-O-C bonds was observed.”
Maranescu 等 - 2018 - The corrosion inhibitor behavior of iron in saline DOI: 10.1515/pac-2018-0513 -
încredere 1,0
“The peak at 1343.2 suggested In the case of FTIR spectra of norfloxacin, prominent for symmetric stretching vibration of the O-C-O group.”
Sahoo 等 - 2012 - FTIR and Raman Spectroscopic Investigations of a N DOI: 10.4103/0975-1483.100017 -
Amide încredere 1,0
“1379 is not present in the spectra of and The shoulder observed at in the spectra of samples prepared in mildly acidic and neutral media, assigned to C-N stretching, is cm-1 transformed to a well-defined peak at 1343 and 1347 in the spectra”
Trchova 和 Stejskal - 2011 - Polyaniline The infrared spectroscopy of conducti DOI: 10.1351/PAC-REP-10-02-01
Aveți un spectru cu această bandă?
Încărcați spectrul FTIR și obțineți un raport complet de interpretare — atribuiri de peak-uri cu citări din literatură, potriviri cu biblioteca și un lanț de dovezi cu nivel de încredere — în câteva secunde.