What absorbs at 444 cm⁻¹ in an FTIR spectrum?
A band near 444 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 7 cited sources
Quick answer
A band near 444 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 0 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 0 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| copper oxide | 444, 624, 1686 | Hydroxyl (O-H), Metal oxygen, Alkyl C-H | 1 |
| copper oxide nanoparticles | 444, 624, 1317 | Hydroxyl (O-H), Metal oxygen, Alkyl C-H | 1 |
| alumina | 444, 460, 1000 | Metal oxygen, Hydroxyl (O-H), Alkyl C-H | 1 |
| iron oxide nanoparticles | 444, 2972, 528 | Hydroxyl (O-H), Alkyl C-H, Metal oxygen | 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 444 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
-
Metal oxygen আত্মবিশ্বাস 1.0
“LLM confirmed rule peak-group candidate”
Mohamed 等 - 2020 - Bio-redox potential of Hyphaene thebaica in bio-fa DOI: 10.1016/j.msec.2020.110890 -
Thiol আত্মবিশ্বাস 1.0
“FTIR technique in middle infrared (400-4000 cm-1) CH 2-CH-SH bending vibration modes (444”
Gomez-Montano 等 - 2020 - Detection of Salmonella enterica on silicon substr DOI: 10.24275/rmiq/Bio993 -
Hydroxyl (O-H) আত্মবিশ্বাস 1.0
“cm-1 cm-1 at 444 and 579 and OH stretching at 3117 (Figure 2b).”
Green and Traditional Synthesis of Copper Oxide Nanoparticles—Comparative Study DOI: 10.3390/nano10122502 -
Aromatic ring আত্মবিশ্বাস 1.0
“Whereas, the second exothermic peak around 444 °C is related to the combustion of SA, which has a more firm benzene structure rather than chain hydrocarbons.”
Marangoni effect induced macro porous surface films prepared through a facile sol-gel route DOI: 10.1038/s41598-017-05506-7 -
Hydroxyl (O-H) আত্মবিশ্বাস 1.0
“cm-1, attributed to the v(O-H), indicate the presence of The broad absorption bands at about 3,444 cm-1 and resulting from δ(O-H) bends water in this compound.”
Wang 等 - 2009 - Synthesis, Crystal Structure, and Kinetics of the DOI: 10.3390/molecules14072582 -
Metal oxygen আত্মবিশ্বাস 0.9
“Explicit assignment: bending peak of Al-O bond”
Effect of alumina on the performance and characterization of cross-linked PVA / PEG 600 blended membranes for CO2/N2 separation DOI: 10.1016/j.seppur.2018.08.026 -
Metal oxygen আত্মবিশ্বাস 0.9
“Explicit assignment: 'Fe-O (444 cm-1)'”
Removal of Tetracycline by Hydrous Ferric Oxide: Adsorption Kinetics, Isotherms, and Mechanism DOI: 10.3390/ijerph16224580
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।