What absorbs at 1950 cm⁻¹ in an FTIR spectrum?
A band near 1950 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 5 cited sources
Kiire vastus
A band near 1950 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 |
|---|---|---|---|
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Nitrile | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
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 1950 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
-
Acetate usaldusväärsus 1,0
“≅960+1000 combination band C=O stretching shoulder Weak 1950 SiO2 1880-1866 ≅697+1163 SiO2 combination band”
FTIR photoacoustic spectroscopy for identification and assessment of soil components_ Chernozems and their size fractions DOI: 10.1016/j.pacs.2020.100162 -
Carbonyl (C=O) usaldusväärsus 1,0
“Although CO (or H Re-CO bands, if present, indicate larger clusters of Re on the cm-1 were found on CoRe(N), carbonyl bands around 1950 surface.”
Kumar 等 - 2011 - In Situ FT-IR Study on the Effect of Cobalt Precur DOI: 10.1021/jp104878e -
usaldusväärsus 1,0
“Based on these former reports [56,57,62,66,67], as described 1950cm-1 above we assigned the new band at on Pt/C and 1960cm-1 on Pt-B to asymmetric bridged CO, CO(B) asym., which might be adsorbed on (100) terraces exposed on nano-”
Sato 等 - 2007 - Adsorptionoxidation of CO on highly dispersed Pt DOI: 10.1016/j.electacta.2007.05.007 -
Nitrile usaldusväärsus 1,0
“cm-1 Three novel CO bands were detected at 1950, 1936, and 1927 alongside a larger number of cyanide bands.”
Infrared Characterization of the Bidirectional Oxygen-Sensitive [NiFe]-Hydrogenase from E. coli DOI: 10.3390/catal8110530 -
usaldusväärsus 0,4
“Text: '1950cm-1 ν (M´' (incomplete, likely carbonyl stretching)”
Duchatelet 等 - 2009 - An approach to retrieve information on the carbony DOI: 10.1029//2005GL022386
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.