What absorbs at 1169 cm⁻¹ in an FTIR spectrum?
A band near 1169 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 1169 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.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| Methoxy (OCH3) | 6 | 5 | 1.0 |
| Methacrylate | 6 | 5 | 1.0 |
| C-O single bond | 6 | 5 | 1.0 |
| Acetate | 6 | 5 | 1.0 |
| Alkyl C-H | 4 | 4 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| S eq o | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Sulfonyl | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 0.6 |
| Fluorine (C-F) | 1 | 0 | 1.0 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
Possible materials
| 材料 | 支持峰 | Overlapping groups | 引用来源 |
|---|---|---|---|
| silica | 1169, 1100, 1080 | Methacrylate, Acetate | 1 |
| polystyrene | 1169, 1020, 1600 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| wood | 1169, 1740, 1730 | 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 1169 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.
这些分配背后的文献
-
Carboxyl (COOH) 置信度 1.0
“shoulder band at about The 1459 and 1384cm-1 bands are methyl bending signals and bands at 1243 1169cm-1 The different samples of coatings of amphorae were studied are different bending vibrations from COOH.”
Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021 -
Acetate 置信度 1.0
“The C-O-H bending vibrations of the CH 2-OH group appeared at 1435 and the cellulose cm1 skeleton vibrations, including the C-O-C bridge stretching, appeared at 1169 (Hinterstoisser et al., 2001).”
Wang 等 - 2022 - Molecular-level characterization of changes in the DOI: 10.21203/rs.3.rs-882939/v1 -
Amide 置信度 1.0
“At 50 the absorption intensity at 1169 at 1409 is assigned to the forcm(cid:0) ◦C 1 C-N is 0.98 a.u., but at 150 it is 1.33 a.u.”
Curing mechanism of triglycidylamine crosslinked soybean protein adhesive analyzed by Fourier transform infrared, second derivative infrared and two-dimensional correlation spectroscopy DOI: 10.1016/j.ijadhadh.2021.102825 -
Alkyl C-H 置信度 1.0
“cm-1 Bands at 1169 and 1156 arise from a combination of OH and CH bending vibrations [54].”
Direct Quantification of Drug Loading Content in Polymeric Nanoparticles by Infrared Spectroscopy DOI: 10.3390/pharmaceutics12100912 -
Ester 置信度 1.0
“Explicitly assigned to ester group vibrations.”
Biowaxes from Palm Oil as Promising Candidates for Cosmetic Matrices and Pharmaceuticals for Human Use DOI: 10.3390/ma16124402 -
置信度 1.0
“11c) measured after curing for 10 months, the Si-O-Si band (1080 cm-1) is remarkably more pronounced, while the faint Si-O-C band (1169 that is detected in 28 days is barely detected in 10 months, suggesting that polymerization has proceede”
Karatasios 等 - 2017 - Modification of water transport properties of poro DOI: 10.1515/pac-2016-1104 -
Aromatic ring 置信度 1.0
“Newly cm-1 O=S=O, appearing peaks at 1169, 956, and 2923 are attributed to the benzene ring group and O=S=O -CH stretching vibrations in the PSSNa molecule, the peaks for and benzene ring shift by 2”
Liu 等 - 2019 - Novel Selective Depressant of Titanaugite and Impl DOI: 10.3390/min9110703 -
Amide 置信度 1.0
“940 cm-1 and 1169 cm-1 are C-N stretching vibrations of imidazole groups and C=N stretchThe absorption peak at 903 cm-1 originated from the epoxy group of the polymer, which ing vibrations at 1570 cm-1 [22].”
Design and Preparation of Imidazole Ionic Liquid-Based Magnetic Polymers and Its Adsorption on Sunset Yellow Dye DOI: 10.3390/ma15072628
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