What absorbs at 856 cm⁻¹ in an FTIR spectrum?
A band near 856 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
إجابة سريعة
A band near 856 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.
تعيينات المجموعات الوظيفية المحتملة
| مجموعة وظيفية | حقائق داعمة | المصادر المستشهد بها | أعلى ثقة |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Lignin | 1 | 0 | 1,0 |
يعكس الترتيب الأدلة الأدبية المتراكمة، وليس قاعدة واحدة موثوقة. تأكد دائمًا من سياق عينتك.
المواد المحتملة
| مادة | القمم الداعمة | المجموعات المتداخلة | المصادر المستشهد بها |
|---|---|---|---|
| PVA | 856, 1660, 2930 | Alkyl C-H, Acetate, Methacrylate | 1 |
| MWCNT | 856, 2876, 1430 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 1 |
| Cellulose | 856, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| lignin | 856, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| poly(vinyl alcohol) | 856, 1700, 2993 | Acetate, Methacrylate, Alkyl C-H | 1 |
| CeO2 | 856, 1554, 1630 | Acetate, Methacrylate, Methoxy (OCH3) | 1 |
تظهر المواد فقط عندما يدعم نفس مجموعة الأدبيات هذا النطاق وذروة مميزة إضافية واحدة على الأقل.
منطق الطيف
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 856 cm⁻¹ is usually not enough for material identification by itself.
الاستخدام في العالم الحقيقي
هذا النوع من الاستعلام شائع في تحديد البوليمر، وفحص البلاستيك غير المعروف، واستكشاف أخطاء مراقبة الجودة، والتحقق من المواد المعاد تدويرها، ومراجعة تعيين القمم المدعومة بالأدبيات.
الأخطاء الشائعة
- معالجة نطاق معزول واحد كدليل على المادة دون التحقق من ذروة داعمة واحدة أو اثنتين على الأقل.
- تجاهل التداخل: يمكن أن تساهم مجموعات وظيفية متعددة بالقرب من نفس رقم الموجة.
- تخطي التحقق من الصحة عندما قد تؤدي الإضافات أو الخلائط أو الأكسدة أو التلوث إلى تشويه الطيف.
نصيحة التحقق
عندما يبقى الغموض، تحقق من الفرضية باستخدام DSC أو GC-MS أو TGA، خاصة للمخاليط والعينات المتحللة والبوليمرات المملوءة.
الأدبيات وراء هذه التعيينات
-
C c single bond الثقة 1,0
“4 (a)] showed features spectrum band at 2946.67 1 cm-1 (stretching vibration of C-H from alkyl group), 1142.72 ( C-O stretching vibration, 1436.69 cm-1 cm-1 cm-1 (-CH 2stretching), 855.72 (C-C stretching) and the absorption band at 3631.72”
Sprayed in-situ synthesis of Polyvinyl alcohol/Chitosan loaded Silver nanocomposite hydrogel for improved antibacterial effects DOI: 10.1016/j.ijbiomac.2019.09.186 -
Oxygen heterocycle الثقة 1,0
“Pure epoxy resin showed peaks near 856 which might be due to oxirane functionality of the epoxidized novolac resin.”
Srivastava 等 - 2018 - Studies on the structural changes during curing of DOI: 10.1016/j.saa.2017.06.066 -
Carbonate الثقة 1,0
“In addition, characteristic bands of bidentate carbonates can be visualized at 1576, 1290, 1013, and 856 cm-1, corresponding to the stretching modes υas (CO3) for the first two bands, υs (CO3) for the following, and π (CO3) for the last [88”
CO2 Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements DOI: 10.3390/catal13020448 -
Alkyl C-H الثقة 1,0
“for example, Figure single aryl CH vibration was observed at 856 for lignin g-h °C, shows foams fabricated at 300, 500, 700, and 900 and but was not observed for WS or SBP (Figure 4a,d).”
Gupta 等 - 2020 - On the Design of Novel Biofoams Using Lignin, Whea DOI: 10.1021/acsomega.0c00721 -
Acetate الثقة 1,0
“The absorbance bands around 856, 930, 996, 1077, 1149, cm-1 and 1242 were related to the C-O stretching, C-H rocking vibrations, and C-O-C”
Extraction and Characterization of Potential Biodegradable Materials Based on Dioscorea hispida Tubers DOI: 10.3390/polym13040584 -
الثقة 1,0
“Figure 6e,f present Ni 2p XPS spectra, revealing the existence of peaks at binding energies 855.5 eV and 873.4 eV representing Ni 2p and Ni 2p 1/2, respectively, and the separating energy is”
Nickel Oxide-Carbon Soot-Cellulose Acetate Nanocomposite for the Detection of Mesitylene Vapour: Investigating the Sensing Mechanism Using an LCR Meter Coupled to an FTIR Spectrometer DOI: 10.3390/nano -
الثقة 1,0
“The Ni2p spectrum displays a main peak at 856.1 eV attributed to Ni(OH) 2.”
Synthesis of NiFeOx nanocatalysts from metal–organic precursors for the oxygen evolution reaction DOI: 10.1039/D2DT01370C -
الثقة 1,0
“Peaks at 855.65 and 872.90 eV indicates to Ni 2p3/2 2p1/2 and Ni energy levels, respectively.”
Ni(OH)2-decorated nitrogen doped MWCNT nanosheets as an efficient electrode for high performance supercapacitors DOI: 10.1038/s41598-019-42281-z
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