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
Kiire vastus
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.
Võimalikud funktsionaalrühmade määramised
| Funktsionaalrühm | Toetavad faktid | Tsiteeritud allikad | Kõrgeim usaldusväärsus |
|---|---|---|---|
| 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 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| 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 |
Materjale kuvatakse ainult siis, kui sama kirjanduse kogum toetab seda riba ja vähemalt ühte täiendavat iseloomulikku piiki.
Spektri loogika
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.
Reaalse maailma kasutus
Seda tüüpi päring on tavaline polümeeri tuvastamisel, tundmatu plasti sõeluuringul, kvaliteedikontrolli probleemide lahendamisel, ringlussevõetud materjali kontrollimisel ja kirjandusel põhineval piirkinnituste ülevaatel.
Levinud vead
- Ühe isoleeritud riba käsitlemine materjali tõendina ilma vähemalt ühte või kahte toetavat piiki kontrollimata.
- Ülekattumise ignoreerimine: mitu funktsionaalrühma võivad anda panuse sama lainearvu lähedal.
- Valideerimise vahelejätmine, kui lisandid, segud, oksüdatsioon või saastumine võivad spektrit moonutada.
Kontrollimise nõuanne
Kui ebakindlus püsib, kinnitage hüpotees DSC, GC-MS või TGA abil, eriti segude, lagunenud proovide ja täidetud polümeeride puhul.
Nende määramiste taga olev kirjandus
-
Alkyl C-H usaldusväärsus 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 usaldusväärsus 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 usaldusväärsus 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) usaldusväärsus 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 usaldusväärsus 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 -
usaldusväärsus 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 -
usaldusväärsus 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
Kas teil on selle ribaga spekter?
Laadige üles oma FTIR spekter ja saage sekunditega täielik tõlgendusaruanne — piikide määramised kirjandusviidetega, raamatukogu vasted ja usaldusväärsusega hinnatud tõendite ahel.