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
Jawapan pantas
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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| 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 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Bahan yang mungkin
| Bahan | Puncak sokongan | Kumpulan bertindih | Sumber dipetik |
|---|---|---|---|
| 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 |
Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.
Logik spektrum
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.
Penggunaan dunia sebenar
Jenis pertanyaan ini biasa dalam pengenalpastian polimer, saringan plastik tidak diketahui, penyelesaian masalah QC, pengesahan bahan kitar semula, dan semakan tugasan puncak yang disokong oleh literatur.
Kesilapan biasa
- Menganggap satu jalur terpencil sebagai bukti bahan tanpa memeriksa sekurang-kurangnya satu atau dua puncak sokongan.
- Mengabaikan pertindihan: pelbagai kumpulan berfungsi boleh menyumbang berhampiran nombor gelombang yang sama.
- Melangkau pengesahan apabila bahan tambahan, campuran, pengoksidaan, atau pencemaran boleh memesongkan spektrum.
Nasihat pengesahan
Apabila kekaburan masih ada, sahkan hipotesis dengan DSC, GC-MS, atau TGA, terutamanya untuk campuran, sampel terdegradasi, dan polimer terisi.
Literatur di sebalik penetapan ini
-
Carboxyl (COOH) keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 keyakinan 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 -
keyakinan 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 keyakinan 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 keyakinan 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
Ada spektrum dengan jalur ini?
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