What absorbs at 839 cm⁻¹ in an FTIR spectrum?
A band near 839 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 839 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.
সম্ভাব্য কার্যকরী-গ্রুপ অ্যাসাইনমেন্ট
| কার্যকরী গ্রুপ | সমর্থনকারী তথ্য | উদ্ধৃত সূত্র | সর্বোচ্চ আত্মবিশ্বাস |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 0.9 |
র্যাঙ্কিং জমা হওয়া সাহিত্য প্রমাণ প্রতিফলিত করে, একটি একক কর্তৃত্বপূর্ণ নিয়ম নয়। সর্বদা আপনার নমুনা প্রসঙ্গের বিরুদ্ধে নিশ্চিত করুন।
Possible materials
| উপাদান | সমর্থনকারী শিখর | Overlapping groups | উদ্ধৃত সূত্র |
|---|---|---|---|
| PVA | 839, 1660, 2930 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| PVP | 839, 2983, 1648 | Alkyl C-H, Methacrylate | 1 |
| SiO | 839, 800, 1745 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| CaO | 839, 2909, 1839 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| SiO2 | 839, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 1 |
| Al2O3 | 839, 1722, 1383 | Methacrylate, 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 839 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.
এই অ্যাসাইনমেন্টগুলোর পেছনে সাহিত্য
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Metal oxygen আত্মবিশ্বাস 1.0
“cm-1), cm-1), cm-1 (*1,037 (*913 AlAlOH AlMgOH *1,614 The shift of peak at in sample II to higher cm-1), (*839 deformation vibrations of Al-O-Si groups frequency is due to the existence of 2,4-DMP in protonated cm-1), cm-1) (*518 (*449 and”
Janik 等 - 2013 - Effect of different dimethylphenols on the interac DOI: 10.1007/s10973-013-2990-x -
Alkyl C-H আত্মবিশ্বাস 1.0
“Vials were subat 1524.26 cm-1, 1308.30 cm-1, and at 839.48 cm-1 was jected to mechanical shaking at 400 rpm for 24 h observed due to C-H stretching, C-C stretching and”
Batool 等 - 2019 - USE OF GLUTARIC ACID TO IMPROVE THE SOLUBILITY AND DOI: 10.32383/appdr/94246 -
C c single bond আত্মবিশ্বাস 1.0
“The fingerprint region of the IR absorption spectra (Figure 3a,b) reveals typical absorption bands The fingerprint region of the IR absorption spectra (Figure 3a,b) reveals typical absorption bands cm-1 of PVA, occurring at 839, 917 and 108”
Croitoru 等 - 2020 - Physically Crosslinked Poly (Vinyl Alcohol)Kappa- DOI: 10.3390/polym12030560 -
Alkyl C-H আত্মবিশ্বাস 1.0
“LLM confirmed rule peak-group candidate”
Elhosiny Ali 等 - 2022 - Microstructure Study and LinearNonlinear Optical DOI: 10.3390/polym14091741 -
C c single bond আত্মবিশ্বাস 1.0
“(cm-1) (cm-1) assignment observed wavelength for PVA observed wavelength for ZnS-PVA reference OH stretching 3280 3290 [20,21] CH2 asymmetric stretching 2917 2923 [20,21] C=O carbonyl stretching 1690 1718 [20-22] CH2 bending 1425 1430 [20,2”
Structural, optical, opto-thermal and thermal properties of ZnS–PVA nanofluids synthesized through a radiolytic approach DOI: 10.3762/bjnano.6.55 -
আত্মবিশ্বাস 1.0
“Al-O4]5vibration of [AlO 28-29 - 791 778 770 772 Symmetric stretching 839 837 837 835 837 Stretching Si-O-Al vibration 29-30 Raman shift (cm-1)”
Kim 等 - 2013 - Viscous Behavior of Alumina Rich Calcium-Silicate DOI: 10.2355/isijinternational.53.170 -
Acetate আত্মবিশ্বাস 1.0
“β γ, δ ε Ar-O-), 1.80-1.75 (m, 4H, to Ar-O-), 1.48-1.38 (m, 10H, and to Ar-O-) 1,10-Bis[4-(pyreneiminomethylidene)-phenoxy]-decane cm-1): ν, FTIR (KBr, 3037 (=C-H stretch of the aromatic rings), 2922, 2850 (C-H stretch of aliphatic chains),”
Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups DOI: 10.3390/molecules26082183 -
Ring structure আত্মবিশ্বাস 1.0
“735-657cm-1isassignedtoamideorCH 2rockingband[18],839cm-1 cm-1 water,2890 is related tothe asymmetrically stretching vibration cm-1 C\\H C\\C of in a pyranoid ring, and the band at 3332 is attributed to the vibrations occurred due to ring b”
Polyethersulfone membrane embedded with amine functionalized microcrystalline cellulose DOI: 10.1016/j.ijbiomac.2020.09.017
এই ব্যান্ডের সাথে একটি স্পেকট্রাম আছে?
আপনার FTIR স্পেকট্রাম আপলোড করুন এবং সেকেন্ডের মধ্যে একটি সম্পূর্ণ ব্যাখ্যা রিপোর্ট পান — সাহিত্য সাইটেশন সহ পিক অ্যাসাইনমেন্ট, লাইব্রেরি ম্যাচ এবং একটি আত্মবিশ্বাস-রেটেড এভিডেন্স চেইন।