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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| 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.
Literatūra aiz šiem piešķīrumiem
-
Metal oxygen pārliecība 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 pārliecība 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) pārliecība 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 pārliecība 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) pārliecība 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 pārliecība 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 pārliecība 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
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