What absorbs at 2169 cm⁻¹ in an FTIR spectrum?
A band near 2169 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
Hurtigt svar
A band near 2169 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Silicon hydride | 3 | 3 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Spektrumlogik
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 2169 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
N-O bond tillid 1,0
“cm-1 frequency bubbled with CO gas, no peak at 2169 (from a maximum of ca.”
Mucalo 等 - 2007 - In situ characterisation of the aqueous gold collo DOI: 10.1016/j.jcis.2007.01.058 -
Silicon hydride tillid 1,0
“7.9 - 2 Si-H rock 665 106 Si-H(N 2Si) stretching 2169”
Ay 和 Aydinli - 2004 - Comparative investigation of hydrogen bonding in s DOI: 10.1016/j.optmat.2003.12.004 -
Alkyl C-H tillid 1,0
“cm-1 aliphatic CH 2, the band has asymmetric and symmetrical vibration stretches at 2169 The band at 1606 cm-1 is due to the CO in CHO group.”
Theoretical, chemical, and electrochemical studies of Equisetum arvense extract as an impactful inhibitor of steel corrosion in 2 M HCl electrolyte DOI: 10.1038/s41598-022-06215-6 -
Silicon carbon tillid 1,0
“a Estimated by comparing the ratios of integral intensities of Si-H (at ity of these compounds in hydrosilylation reaction with cm-1) cm-1) 2169 and Si-CH (at 1262 bands in the FTIR spectra of 3 PHMS appears to be rather complex.”
Owinska 等 - 2021 - Functionalization of polyhydromethylsiloxane with DOI: 10.1007/s10965-021-02503-3 -
Silicon hydride tillid 0,9
“Explicit assignment: 'Si-H determined by complete disappearance of the IR absorption at about 2169 cm-1'”
Functionalization of surface-grafted polymethylhydrosiloxane thin films with Alkyl side chains DOI: 10.1002/pola.22691
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