What absorbs at 2903 cm⁻¹ in an FTIR spectrum?
A band near 2903 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
Kiire vastus
A band near 2903 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 | 4 | 4 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Ring 6m | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 0,8 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| alginate | 2903, 1100, 1715 | Alkyl C-H | 1 |
| cellulose | 2903, 1735, 1650 | Alkyl C-H | 1 |
| hemicellulose | 2903, 1730, 897 | Alkyl C-H | 1 |
| GO | 2903, 1720, 1182 | Alkyl C-H | 1 |
| collagen | 2903, 1408, 1660 | Alkyl C-H, N h | 1 |
| sodium alginate | 2903, 1636, 1080 | 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 2903 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
“Figure 1a reveals a broad and intense band in the region of 3321 cm-1 stretching vibrations of cellulose, hemicellulose, and lignin [14, 15] while a peak at 2903 corresponded cm-1 to the -CH stretching vibrations.”
Nanocellulose-silica polyethersulfone hybrid composite stabilized lipase for esterification DOI: 10.1063/1.5125521 -
Alkyl C-H usaldusväärsus 1,0
“LLM confirmed rule peak-group candidate”
Characteristics and Preparation of Designed Alginate-Based Composite Scaffold Membranes with Decellularized Fibrous Micro-Scaffold Structures from Porcine Skin DOI: 10.3390/polym13203464 -
Alkyl C-H usaldusväärsus 1,0
“phospholipids cm-1 The 2903 and 2861 bands represented the CH symmetric stretch, and”
Lazaro-Pacheco 等 - 2022 - Deciphering the structural and chemical compositio DOI: 10.1080/05704928.2020.1843471 -
usaldusväärsus 1,0
“The changes in Si-O-Si bonds The two peaks at 2903 and 2829 corresponding cm-1 cm-1 occurring in between 1100 -1000 were due to the to asymmetrical and symmetrical stretching of CH and 3”
Loganathan 和 Chandrasekar - 2013 - Analysis of Surface Tracking of Micro and Nano Siz DOI: 10.5370/JEET.2013.8.2.345 -
Amine primary usaldusväärsus 1,0
“cm-1 the peaks 2903 and 2851 Primary amine, NH bend group is responsible for the peaks 1614 and 1524 The 1232 peak is produced by cm-1.”
Manjunatha 等 - 2023 - Eco-friendly synthesized silver nanoparticles from DOI: 10.21203/rs.3.rs-2345744/v1 -
Alkyl C-H usaldusväärsus 1,0
“LLM confirmed rule peak-group candidate”
Adapalene-loaded poly(#_#x03B5;-caprolactone) microparticles: Physicochemical characterization and in vitro penetration by photoacoustic spectroscopy DOI: 10.1371/journal. -
usaldusväärsus 1,0
“1472 sity due to formation of the reduced dimers which contain the same cm-1is The band at 2903 attributed to the N-H stretching of groups.”
Spectroelectrochemical studies of poly(N-methylaniline) formation, redox behaviour and degradation. A comparison with polyaniline DOI: 10.1016/j.electacta.2013.10.179 -
Carbohydrate usaldusväärsus 0,8
“Hydrogen bond stretching of CH and CH of cellulose.”
Enhanced arsenic (iii) adsorption from aqueous solution by magnetic pine cone biomass DOI: 10.1016/j.matchemphys.2018.09.067
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.