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
Ātra atbilde
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| 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 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
Alkyl C-H pārliecība 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 pārliecība 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) pārliecība 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) pārliecība 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) pārliecība 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 pārliecība 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) pārliecība 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 pārliecība 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
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