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
Hurtigt svar
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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 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 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 993 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
-
Amide tillid 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 tillid 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 tillid 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 tillid 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 -
tillid 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 tillid 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 tillid 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) tillid 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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