What absorbs at 1233 cm⁻¹ in an FTIR spectrum?
A band near 1233 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 1233 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Amide | 11 | 10 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| C-O single bond | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| chitosan | 1233, 1650, 1655 | Amide, Acetate, Methacrylate | 2 |
| CeO2 | 1233, 1554, 1630 | Acetate, Methacrylate, C-O single bond | 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 1233 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.
Literatūra aiz šiem piešķīrumiem
-
Acetate pārliecība 1,0
“carbon-hydrogen or C-O band stretching (1233 this is why no characteristic peak was appeared due to cm-1 The broad peak at 3326 is the characteristic band for”
Awal 等 - 2012 - Thermal analysis and spectroscopic studies of elec DOI: 10.1007/s10973-011-1875-0 -
Amide pārliecība 1,0
“cm-1 The moderate absorption peak at 1233 at 1298 C N, C C, C C, C O, C H, P S, P O, and other molewas the result of C O stretching vibration absorption.”
Li 等 - 2012 - Feasibility study of the detection of chlorpyrifos DOI: 10.1117/1.OE.51.10.103204 -
Amide pārliecība 1,0
“These peaks showed a shift to 1560 and 2 cm-1, 1460 respectively in bare chitosan-gelatin xerogel and xerogel composite (Figure 3 E) Pre-pro cm-1 Similarly, characteristic peak at 1233 of amide III (C=O and -NH vibrations) of gelatin”
Design and synthesis of a new topical agent for halting blood loss rapidly: A multimodal chitosan-gelatin xerogel composite loaded with silica nanoparticles and calcium DOI: 10.1016/j.colsurfb.2020.111454 -
Nucleic acid pārliecība 1,0
“of phosphates is greatly suppressed in comparison with 51 the symmetric one, and differently structured compared to 52 the corresponding RNA and ds-DNA bands (band components are peaked at ~1247 cm-1, ~1233 cm-1 and ~1219 53”
Zucchiatti 等 - 2016 - Contribution of Ribonucleic Acid (RNA) to the Four DOI: 10.1021/acs.analchem.6b02744 -
Amide pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Casanova 等 - 2020 - Physico-chemical, structural and techno-functional DOI: 10.1016/j.ijbiomac.2020.04.047 -
Alkene (C=C) pārliecība 1,0
“cm-1 ± THR 23.42 0.9 at 1462 (asymmetrical) and at 1396 (symmetrical).51 cm-1 ± ∑ΕΑΑs ± GLU 80.34 0.3 216.81 11.7 The bands at 1233 and 1094 are antisym- ± ∑ΒCΑΑs ± ASP 151.75 0.7 131.21 6.8 metrical and symmetrical double-bond stretching v”
Combined Neutrase-Alcalase Protein Hydrolysates from Hazelnut Meal, a Potential Functional Food Ingredient DOI: 10.1021/acsomega.2c07157 -
Amide pārliecība 1,0
“In C-O, C-C, C-H (genipin) 3089, 1441, 721 2320 cm-1 addition, the C-N stretching of amide III at 1233 shifted to 1260 C-C, C-O, C-N (absorption 2884, 2683, 1952 1955, 1334, 1090, 924 cm-1 cm-1, after crosslinking with genipin, while the pe”
Delgadillo-Armendariz 等 - 2014 - INTERACTIONS OF CHITOSANGENIPIN HYDROGELS DURING DOI: 10.5935/0100-4042.20140243 -
Hydroxyl (O-H) pārliecība 1,0
“cm-1 cm-1 (υ 1652 and 1447 (CO 3)), whilst the band at 1233 would correspond to as δ the bending (OH).”
CO2 Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements DOI: 10.3390/catal13020448
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