What absorbs at 993 cm⁻¹ in an FTIR spectrum?
A band near 993 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 993 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 |
|---|---|---|---|
| Carbohydrate | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metal oxo | 1 | 0 | 0,8 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
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 993 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
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Amide încredere 1,0
“cm(cid:2)1 C]O 1631.77 was due to the stretching (amide I), cm(cid:2)1 and a peak at 993.33 suggested the presence of an ether 20(cid:3)) (2q were because two main diffraction peaks ¼11 and group in the film.”
Bourtoom 和 Chinnan - 2008 - Preparation and properties of rice starch-chitosan DOI: 10.1016/j.lwt.2007.10.014 -
Acetate încredere 1,0
“1016 C-O, C-C stretching, C-O-H bending 993 C-O-H bending 924 C-O-C skeletal mode of 𝛼-glycosidic linkage 0.14 3.00”
Characterization of Modified Tapioca Starch in Atmospheric Argon Plasma under Diverse Humidity by FTIR Spectroscopy DOI: 10.1088/0256-307X/30/1/018103 -
Amide încredere 1,0
“Amide II (7.08±0.03) (p<0.05) bands for Bacillus species istic peak at 993 801cm(cid:2)1 In addition, there was another characteristic peak at (Fig.”
Use of Fourier transform infrared spectroscopy for rapid comparative analysis of Bacillus and Micrococcus isolates DOI: 10.1016/j.foodchem.2008.08.063 -
Carbohydrate încredere 1,0
“FTIR spectra of NMB and NNMB ferulated arabinoxylans depicted the presence of polysaccharide compounds and the correspondingbandwasobservedat993cm-1,whichisduetoglycosidicbondvibration.”
Biochemical and Structural Characterization of Ferulated Arabinoxylans Extracted from Nixtamalized and Non-Nixtamalized Maize Bran DOI: 10.3390/foods11213374 -
încredere 1,0
“This implies that no asymmetric S O bending vibrations), 993 1symmetric S O cm-1 degradation/corrosion was induced at the steel substrate for major ((cid:4) stretching vibration) and between 1085 and 1185 asym-”
Simultaneous in situ Kelvin probe and Raman spectroscopy analysis of electrode potentials and molecular structures at polymer covered salt layers on steel DOI: 10.1016/j.electacta.2012.08.042 -
N h încredere 1,0
“The presence of OLA group on CZTSe nanocrystals is indicated by NH bending modes at 909, 964 and 2 993cm-1, 1468cm-1, C-H bending mode at NH scissor mode at 2 1568cm-1 2955cm-1.”
Hot-injection synthesis and characterization of quaternary Cu2ZnSnSe4 nanocrystals DOI: 10.1016/j.matlet.2010.03.034 -
Metal oxygen încredere 1,0
“In the following sections, detailed discussions will be made on 42V V O-H the and bands of SO and the water stretching (cid:24)993 cm-1 1 3 another component at (simple CIPs) actually comes envelope in supersaturated MgSO aerosols.”
Zhao 等 - 2006 - Magnesium sulfate aerosols studied by FTIR spectro DOI: 10.1021/jp055291i -
Alkene (C=C) încredere 1,0
“Complexation had no effect on several bands, such as those in the furan ring and cm-1, alkene chain, resulting in the following bands: absorption at 993 which is the out-ofcm-1 plane =C-H bending mode of the trans di-substituted alkene [31]”
Synthesis, Characterization and Biological Activities of New Schiff Base Compound and Its Lanthanide Complexes DOI: 10.3390/ph15040454
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