What absorbs at 783 cm⁻¹ in an FTIR spectrum?
A band near 783 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 783 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 |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Metal oxo | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,8 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| MWCNT | 783, 2876, 1430 | Alkyl C-H | 1 |
| TiO2 | 783, 1700, 1093 | Metal oxygen, Alkyl C-H | 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 783 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.
Литература, лежащая в основе этих назначений
-
Amide достоверность 1,0
“the FTIR spectra of as prepared PPy showed the important characteristic cm-1, peaks at 783 which corresponds C-N vibration.”
Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142 -
достоверность 1,0
“Furthermore, and 783 cm-1, which have been assigned to Ti-O-Ti vibrations [34,35].”
Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites DOI: 10.3390/ma15155284 -
N h достоверность 1,0
“The FTIR of LX (pure drug) shown intense bands at 3060 cm-1, 1647 cm-1, 1590 cm-1, cm-1, cm-1 1590 1323 and 783 corresponding to the functional groups NH, C=O, cm-1, 1323 cm-1, and 783 cm-1 corresponding to the functional groups NH, C=O, CO”
Almotairi 等 - 2022 - Design and Optimization of Lornoxicam Dispersible DOI: 10.3390/ph15121463 -
Alkene (C=C) достоверность 1,0
“Peak at 783.4 indicates treatment with US and O3 C-- To estimate cumulative biogas production, many studies have the presence of alkene compounds and C bending.”
Enhancement of biogas production from individually or co-digested green algae Cheatomorpha linum using ultrasound and ozonation treated biochar DOI: 10.1016/j.ultsonch.2022.106197 -
Hydroxyl (O-H) достоверность 1,0
“cm-1 cm-1 cm-1 3296 (OH vibration), 2947 (asymmetrical CH stretching vibration), 2875 shifted slightly to 1110, 993 and 783 cm-1, respectively.”
Morphology and Selected Properties of Modified Potato Thermoplastic Starch DOI: 10.3390/polym15071762 -
Nucleic acid достоверность 1,0
“In particular, a decrease in Raman bands related to nucleic acids (1484, 783 cm-1) in the log phase compared to lag phase was observed [25].”
Kochan 等 - 2020 - Vibrational Spectroscopy as a Sensitive Probe for DOI: 10.3390/s20123452 -
достоверность 1,0
“The bands at ~3550, (C=O 3406 (OH stretching vibration), and additionally 1113 and 668 cm-1 (S-O stretching and bending, respectively) indicated the presence of gypsum, whereas the bands at 1640, 1325 stretching cm-1 respectively) indicated”
Investigating the Potential of the Er:YAG Laser for the Removal of Cemented Dust from Limestone and Painted Plaster DOI: 10.3390/coatings10111099 -
достоверность 1,0
“30 cm(cid:0) 1, Al(cid:0) OH stretching and bending of tetrahedral 1120 31 Al(cid:0) aluminum is observed, respectively, while O stretching of 32 octahedral aluminum is assigned to the bands at 783 and”
Synthesis and Characterization of Ru‐Loaded Anodized Aluminum Oxide for Hydrogenation Catalysis DOI: 10.1002/open.201900091
Есть спектр с этой полосой?
Загрузите свой FTIR-спектр и получите полный отчет об интерпретации — назначение пиков с цитированием литературы, совпадения с библиотекой и цепочку доказательств с оценкой достоверности — за секунды.