What absorbs at 1276 cm⁻¹ in an FTIR spectrum?
A band near 1276 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
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| N n bond | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Литература, лежащая в основе этих назначений
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Carboxyl (COOH) достоверность 1,0
“are those at 1460 and 2 3 1276cm-1 COOH stretch/bend combination is observed at and 1189cm-1.”
Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021 -
Amide достоверность 1,0
“C-H modes.24,36 be seen in the meta-Ra first metastable intermediate in the Pr indole stretch and bending A tryptophan f C-N Cph1.1 Pfr pathway of indole vibration that contains stretching is reported at 1276 The mutation of a highly conser”
van Thor 等 - 2005 - Assignments of the Pfr-Pr FTIR difference spectrum DOI: 10.1021/jp052323t -
Acetate достоверность 1,0
“= cm-1 the C O stretch at 1680.83 is the result of the conjugaCC = O tion effect where C O stretch absorbs at a lower frequency stretch 1275.89, 1194.05 = cm-1 than normal.”
Chong 等 - 2016 - An improved method for aldol condensation catalyse DOI: 10.1515/gps-2015-0126 -
Aromatic ring достоверность 1,0
“the peak at cm-1 cm-1 1276 is due to phenyl CH rocking vibrations;”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
Acetate достоверность 1,0
“The peak near 1276 is associated with cm-1 C-O stretching vibration.”
Enhanced Saccharification of Purple Alfalfa via Sequential Pretreatment with Acidified Ethylene Glycol and Urea/NaOH DOI: 10.3390/pr10010061 -
Hydroxyl (O-H) достоверность 1,0
“carbonyl groups are denoted by the absorption band at 1737 The absorption bands at cm-1 1276 and 1153 represent the O-H bending and C-O stretching of aliphatic carboxyl and hydroxyl groups overlapping with the C-O stretching of -COOR (Liu e”
Liu 等 - 2019 - Characterization and Identification of Lacquer Fil DOI: 10.1007/BF02467555 -
достоверность 1,0
“Explicit assignment in text.”
Natarajan 等 - 2020 - Comparison of MA-g-PP effectiveness through mechan DOI: 10.1590/0104-1428.05620 -
Carbonyl (C=O) достоверность 1,0
“Zhao, contributionstotheprediction.Thepeakat1666cm-1 maybe "Discrimination of Rhizoma Gastrodiae (Tianma) using 3D 1276cm-1 due to carbonyl group [17].”
Qi 等 - 2017 - Quantitative and Qualitative Characterization of G DOI: 10.1155/2017/3194146
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