What absorbs at 1267 cm⁻¹ in an FTIR spectrum?
A band near 1267 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
Быстрый ответ
A band near 1267 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.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Alkyl C-H | 7 | 7 | 1,0 |
| Methacrylate | 7 | 6 | 1,0 |
| Acetate | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Lignin | 2 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 0,9 |
| C=n | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Логика спектра
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 1267 cm⁻¹ is usually not enough for material identification by itself.
Использование в реальных условиях
Такой тип запроса распространен при идентификации полимеров, скрининге неизвестных пластиков, устранении неполадок в контроле качества, проверке переработанных материалов и анализе отнесения пиков на основе литературы.
Распространенные ошибки
- Рассмотрение одной изолированной полосы как доказательства материала без проверки хотя бы одного или двух поддерживающих пиков.
- Игнорирование перекрытия: несколько функциональных групп могут вносить вклад вблизи одного и того же волнового числа.
- Пропуск проверки, когда добавки, смеси, окисление или загрязнение могут исказить спектр.
Рекомендации по проверке
Когда остается неоднозначность, проверьте гипотезу с помощью DSC, GC-MS или TGA, особенно для смесей, деградированных образцов и наполненных полимеров.
Литература, лежащая в основе этих назначений
-
Alkene (C=C) достоверность 1,0
“[30] identified from FT-Raman spectra of olive pomace that the major bands of Figure 2 presents the spectra obtained when concentrations of FAME were evaluated by virgin olive oil were seen at 1267 cm-1 (=C-H), deformation in unconjugated c”
Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy DOI: 10.3390/catal9060535 -
Alkyl C-H достоверность 1,0
“The vibration band at 1267 cm-1, 267 displayed by AgvCca 90 corresponds to vibrations of C-H and C-O bonds (Bureau et al., 2019;”
Vazquez-Vuelvas 等 - 2020 - A comparative FTIR study for supplemented agavin a DOI: 10.1016/j.foodhyd.2020.105642 -
Acetate достоверность 1,0
“Strong stretching C-O vibrations are observed at 1267, 1032cm-1.”
HPTLC and FTIR Fingerprinting of Olive Leaves Extracts and ATR-FTIR Characterisation of Major Flavonoids and Polyphenolics DOI: 10.3390/molecules26226892 -
Alkyl C-H достоверность 1,0
“due to the presence of CH symmetric stretching 3 cm-1 whereas the peaks at about 1267 and 749 may 3.1.2.”
Ahmed 等 - 2013 - Quantitative determination of tolfenamic acid and DOI: 10.2478/s11532-013-0284-6 -
Ester достоверность 1,0
“cm-1 cm-1 the principal bands at 2854 to phenyl groups, the bands at 1267 and 2924 correscorresponds to cm-1 pond to the symmetric and anti-symmetric stretching in ester carbonyl groups, and the band at 1060 correthe CH sponds to primary OH”
Aisha 等 - 2014 - Preparation and characterization of nano liposomes DOI: 10.1155/2011/103039. -
Alkyl C-H достоверность 1,0
“The bands at 1267 cm-1 and 749 cm-1 are attributed to C-H and C-N deformation, respectively [45].”
Regularities of Encapsulation of Tolfenamic Acid and Some Other Non-Steroidal Anti-Inflammatory Drugs in Metal-Organic Framework Based on -Cyclodextrin DOI: 10.3390/pharmaceutics15010071 -
Alkyl C-H достоверность 1,0
“Indian Journal of Pharmaceutical Education and Research | Vol 54 | Issue 3 [Suppl] | Jul-Sep, 2020 Dubey and Dewangan.: Transdermal Patch of Irbesartan for Hypertension cm-1 delivery system of Irbesartan for enhancement of 1375 for C-H Asym”
Dubey 和 Dewangan - 2020 - Rational Design and Characterization of Transderma DOI: 10.5530/ijper.54.3s.145 -
Acetate достоверность 1,0
“cm-1, spectrum at 950 and 855 band with the maximum at 1267 which was the result of coupling between the valence vibration of C-O 365 S.S.”
Ilic-Stojanovic 等 - 2015 - The improved photostability of naproxen in the inc DOI: 10.2298/HEMIND131128050I
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