What absorbs at 2005 cm⁻¹ in an FTIR spectrum?
A band near 2005 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
Mabilis na sagot
A band near 2005 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.
Mga posibleng pagtatalaga ng functional-group
| Grupong functional | Mga sumusuportang katotohanan | Mga nasiping sanggunian | Pinakamataas na kumpiyansa |
|---|---|---|---|
| Alkyl C-H | 4 | 3 | 1.0 |
| Methacrylate | 4 | 3 | 1.0 |
| Acetate | 4 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 3 | 2 | 1.0 |
| C-O single bond | 3 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| N h | 1 | 0 | 1.0 |
Ang pagraranggo ay sumasalamin sa naipon na ebidensya ng literatura, hindi isang solong awtoritatibong tuntunin. Palaging kumpirmahin laban sa konteksto ng iyong sample.
Mga posibleng materyales
| Materyal | Sumusuportang mga peak | Mga overlapping na grupo | Mga nasiping sanggunian |
|---|---|---|---|
| PEG | 2005, 1650, 1342 | Alkyl C-H, Methacrylate, Acetate | 1 |
| cellulose | 2005, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| lignin | 2005, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| hydrogel | 2005, 1632, 1062 | Amide, Methacrylate, Acetate | 1 |
| honey | 2005, 1199, 1345 | Methacrylate, Acetate, Alkyl C-H | 1 |
| gold nanoparticles | 2005, 1638, 3252 | Amide, Alkyl C-H, Methacrylate | 1 |
Ang mga materyales ay ipinapakita lamang kapag ang parehong literatura pool ay sumusuporta sa banda na ito at hindi bababa sa isang karagdagang katangian na tuktok.
Logic ng spectrum
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 2005 cm⁻¹ is usually not enough for material identification by itself.
Paggamit sa totoong mundo
Ang uri ng query na ito ay karaniwan sa pagtukoy ng polymer, screening ng hindi kilalang plastic, pag-troubleshoot ng QC, pag-verify ng recycled na materyal, at pagsusuri ng pagtatalaga ng peak na may suporta ng literatura.
Mga karaniwang pagkakamali
- Pagtrato sa isang nakahiwalay na banda bilang patunay ng isang materyal nang hindi sinusuri ang hindi bababa sa isa o dalawang sumusuportang peak.
- Hindi pinapansin ang overlap: maraming functional group ang maaaring mag-ambag malapit sa parehong wavenumber.
- Pag-laktaw sa pagpapatunay kapag ang mga additives, blends, oxidation, o contamination ay maaaring mag-distort ng spectrum.
Payo sa pagpapatunay
Kapag nananatili ang kalabuan, patunayan ang hypothesis gamit ang DSC, GC-MS, o TGA, lalo na para sa mga blend, degraded na sample, at filled polymers.
Literatura sa likod ng mga pagtatalagang ito
-
Alkyl C-H kumpiyansa 1.0
“Thus the concentration of TPC in carbohydrate structure and characteristic of C H or C O honey is variable and depends on the geographical and stretching vibration (Tewari and Irudayaraj 2005).”
Physicochemical, antioxidant and FTIR-ATR spectroscopy evaluation of Kashmiri honeys as food quality traceability and Himalayan brand DOI: 10.1007/s13197-020-04878-5 -
Acetate kumpiyansa 1.0
“Further, a slight red-shift in the C=O stretching cm-1 Alexandridis 2005;”
Behera 和 Ram - 2013 - Synthesis and characterization of core-shell gold DOI: 10.1007/s13204-012-0076-x -
Carbonyl (C=O) kumpiyansa 1.0
“G-type lignin (Faix, 1991) Lignin 1269 Guaiacyl ring breathing with carbonyl stretching (Kubo and Kadla, 2005) Lignin 1030”
Dinant 等 - 2019 - Synchrotron FTIR and Raman spectroscopy provide un DOI: 10.1093/jxb/ery396 -
Hydroxyl (O-H) kumpiyansa 1.0
“to C=O stretching, C-N stretching, O-H bending and C-H evaluated by X-ray diffractometer, PANAlytical Model PW stretching vibrations, respectively (Can 2005;”
Mahmud 等 - 2018 - Influence of Poly (Ethylene Glycol) on the Charact DOI: 10.17576/jsm-2018-4706-14 -
Hydroxyl (O-H) kumpiyansa 1.0
“AppliedClayScience228(2022)106648 Si-O to the apical vibrations of apical bonds, in-plane Si-O-Si stretching vibrations, Si-O-Al vibrations, inner surface hydroxyl groups Al-O-H O-H vibrations in Al-O-H, respectively (Hoch vibrations and in”
Potential reactivity assessment of mechanically activated kaolin as alternative cement precursor DOI: 10.1016/j.clay.2022.106648 -
C-O single bond kumpiyansa 1.0
“et al., 1964) 2015) C-C (Labb´e p Pectin 1018 (Wilson et al., and C-O, 1504 et al., 2000) OCH vibration 2005) 1018 (McCann et al., 1500 (Sills and”
Unveiling the compositional remodelling of Arbutus unedo L. fruits during ripening DOI: 10.1016/j.scienta.2022.111248 -
Methoxy (OCH3) kumpiyansa 1.0
“2005) and methoxyl vibration (Moran et al.”
Chemical functional groups of extractives, cellulose and lignin extracted from native Leucaena leucocephala bark DOI: 10.1007/s00226-020-01258-2 -
Acetate kumpiyansa 1.0
“cm-1 1600 cm-1 was associated with the C=O stretching of proteins (Jabs 2005) or residual aceWhile the band at 1600 was associated with the C=O stretching of proteins (Jabs cm-1 tate, the low-intensity peak at 3000 cm-1 was associated with”
Minhas 等 - 2023 - Green Synthesis of Zinc Oxide Nanoparticles Using DOI: 10.3390/catal13030549
May spectrum ka ba na may ganitong band?
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