What absorbs at 1115 cm⁻¹ in an FTIR spectrum?
A band near 1115 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 1115 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 4 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Возможные материалы
| Материал | Поддерживающие пики | Перекрывающиеся группы | Цитируемые источники |
|---|---|---|---|
| plasma | 1115, 1656, 1650 | Methacrylate, Acetate | 1 |
| serum | 1115, 1656, 1122 | Methacrylate | 1 |
| lignin | 1115, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| wood | 1115, 1740, 1730 | Methacrylate, Acetate, C-O single bond | 1 |
| PET | 1115, 1408, 800 | Methacrylate, Acetate, C-O single bond | 1 |
| polymer | 1115, 1718, 1722 | Methacrylate, Acetate, C-O single bond | 1 |
Материалы отображаются только при поддержке данной полосы и хотя бы одного дополнительного характеристического пика из того же литературного пула.
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 1115 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
-
Acetate достоверность 1,0
“Two regions, i.e., (1) between The characteristic peaks at 1115 and 1388 cm-1, 3600-3100 and (2) between 1,800 and 1,000 correspond to C-O-H stretching and C-H bending, cm-1 in the FTIR spectra are of particular interest.”
Hernandez-Vargas 等 - 2020 - Development and Characterization of Nanoparticles- DOI: 10.22207/JPAM.14.4.11 -
C c single bond достоверность 1,0
“The peak assignments are: 1122 (C-C cm21 cm21 stretch), 1115 (C-C stretch), 1100 (Si-O cm21 stretch of clay), 1082 (Si-O stretch of clay and”
Loo 和 Gleason - 2004 - Investigation of polymer and nanoclay orientation DOI: 10.1016/j.polymer.2004.06.025 -
достоверность 1,0
“acidophilus sources on BACs production by AA11 a peak at 1115 which is due to the strength of the Cshowed that the highest BACs' activity (12,246 AU/mL) O (Roach et al.”
Optimization of food-grade medium for co-production of bioactive substances by Lactobacillus acidophilus LA-5 for explaining pharmabiotic mechanisms of probiotic DOI: 10.1007/s13197-020-04894-5 -
Phosphate (PO4) достоверность 1,0
“1115 cm-1 cm-1 (C=N (symmetric stretching P-O-C), 1034 (collagen), 1528 guanine, adenine, cytosine) and cm-1 (C=O 1759 ester group vibration of triglycerides).”
New approach to investigate Common Variable Immunodeficiency patients using spectrochemical analysis of blood DOI: 10.1038/s41598-019-43196-5 -
достоверность 1,0
“two peaks at 1115 and 1043 These two last peaks, along cm-1, with the band at 591 can be ascribed to S-O stretches and bending vibrations in schwertmannite (Fe 8O 8(OH) 6SO 4), a hydroxysulfate mineral, commonly found in ocher cm-1 deposits”
Assessment of Easily Accessible Spectroscopic Techniques Coupled with Multivariate Analysis for the Qualitative Characterization and Differentiation of Earth Pigments of Various Provenance DOI: 10.3390/min12060755 -
достоверность 1,0
“cm-1 - the appearance of new bands from 1115 (of high intensity) and 537 were assigned to silica and other oxides from FA, as seen in Figure 3.”
The Influence of Fly Ash on the Mechanical Properties of Water Immersed All Waste Composites DOI: 10.3390/polym14101957 -
Silicon (Si) достоверность 1,0
“253 cm-1, cm-1 For the region below 1200 bands at 1115 and 1042 were related to Si-O 254 cm-1 stretching, and bands at 915-847 were due to AlMOH deformation (M = Al, Fe or Mg) 255”
Franca 等 - 2020 - Monitoring diclofenac adsorption by organophilic a DOI: 10.1016/j.envpol.2013.04.012 -
Acetate достоверность 1,0
“3122.3w grindingandethyl Raman - - - 1671.7 m - 1284.0 s addition, bands observed at 1170, 1150 and 1134 cm-1 in the spectra of physical mixture are shifted to acetate Raman - - - 1671.7m - 1284.0s 3196.3 m lower values at ~1161, 1146 and 1”
Garbacz 等 - 2020 - Structural Characterization of Co-Crystals of Chlo DOI: 10.3390/pharmaceutics12070648
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