What absorbs at 869 cm⁻¹ in an FTIR spectrum?
A band near 869 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
Ātra atbilde
A band near 869 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 | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Carbonate | 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 |
|---|---|---|---|
| HCl | 869, 1708, 1032 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| polycaprolactone | 869, 1580, 1751 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| PLA | 869, 1650, 1073 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| PCL | 869, 1751, 1724 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| biomass | 869, 1082, 1282 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| PAni | 869, 2930, 1300 | Alkyl C-H | 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 869 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
“869cm-1 films C-H and at in PAni doped may be due to out of plane cm-1 film bending.”
Influence of polyaniline doping concentration in (Bi0.5Sb0.5)2S3 thin polycrystalline films on structural, electrical and optical properties DOI: 10.1016/j.jnoncrysol.2010.03.012 -
Metal oxygen pārliecība 1,0
“Another peak at cm-1 869 in the BFD spectrum, can occur from the Al-O stretching in AlO4 tetrahedra of aluminate, or from symmetric Si-O-Si stretching in SiO4 tetrahedra of alite (Ghosh and Handoo, 1980;”
Micro-characterization of Dust and Materials of Dust Origin at a Cement Industry Located in Bangladesh DOI: 10.4209/aaqr.220109 -
Aromatic ring pārliecība 1,0
“The presence of both bands together with the band at 869 due to the aromatic C-H out-of-plane bending vibrations, confirms the presence of a significant amount of hydrolysable tannins in the eucalyptus bark extract.”
Santos 等 - 2023 - Forest by-Product Valorization Pilot-Scale Pinus DOI: 10.3390/f14050895 -
Hydroxyl (O-H) pārliecība 1,0
“literatures10,17 cm-1 According to peak at 1065 is assigned to BRB-PMo hybrid was synthesized by addition of 0.05 12 cm-1 inner P-O a-Mo bond, peak at 790 to Mo-O d-Mo bridges, g/mL aqueous solution of butylrhodamine B dropwise to a cm-1 cm”
Zeng 等 - 2013 - Electrochemical and Fluorescent Investigation of I DOI: 10.14233/ajchem.2013.14039 -
Acetate pārliecība 1,0
“The following bands belong to PCL: C=O stretching (1724, 1182 valence cm-1), cm-1) C-O-C vibrations (869, 1043, and 1109 C=C stretching (1286 [28,33].”
Polymer Composite Materials Based on Polylactide with a Shape Memory Effect for “Self-Fitting” Bone Implants DOI: 10.3390/polym13142367 -
pārliecība 0,9
“Explicit assignment: 'deformation bands 869 cm-1 ... originating from PA'.”
Characterization of New Polymer Material of Amino–Cyclodextrin and Sodium Alginate for Environmental Purposes DOI: 10.3390/membranes13040447 -
pārliecība 0,8
“Micro-window centered at 869 cm-1 for HCl retrieval.”
Retrieval of Stratospheric HNO3 and HCl Based on Ground-Based High-Resolution Fourier Transform Spectroscopy DOI: 10.3390/rs13112159
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