What absorbs at 1805 cm⁻¹ in an FTIR spectrum?
A band near 1805 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
Hiter odgovor
A band near 1805 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.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| N-O bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| polyethylene | 1805, 1737, 1720 | Hydroxyl (O-H) | 1 |
| HDPE | 1805, 1369, 1216 | Hydroxyl (O-H) | 1 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en dodatni karakteristični vrh.
Logika spektra
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 1805 cm⁻¹ is usually not enough for material identification by itself.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
-
zaupanje 1,0
“In particular, addition of 14 cm-1 O to NO slightly increases the amount of Pd(II)-NO complex with ν at ~1865 whereas 15 2 NO 16 cm-1, the low frequency ν band at 1805 assigned to Pd(I)-NO, decreases in intensity.”
Molecular Level Understanding of How Oxygen and Carbon Monoxide Improve NOx Storage in Palladium/SSZ-13 Passive NOx Adsorbers: The Role of NO+ and Pd(II)(CO)(NO) Species DOI: 10.1021/acs.jpcc.8b01007 -
Carbonyl (C=O) zaupanje 1,0
“a consistent amount of ethylene carbonate (EC) is obtained, as cm-1 testified by the presence of a doublet of bands at 1805 and cm-1 1774 that can be easily ascribed to the combined carbonyl stretching modes of the ethylene carbonate.”
Dani 等 - 2015 - Design of high surface area poly(ionic liquid)s to DOI: 10.1039/c5ta00272a -
N-O bond zaupanje 1,0
“In this case a cm(cid:2)1 new band appears at 1805 corresponds to gas phase NO.”
Diaz Consul 等 - 2008 - NO reduction with CO on alumina-modified silica-su DOI: 10.1016/j.apcata.2008.01.022 -
Hydroxyl (O-H) zaupanje 1,0
“1409-1460 C = O (Asymetric stretching) O-H (Bending) 1805 Vibrations of carbonate ions 2512 C = O from calcite”
da Silva 和 Wiebeck - 2022 - ATR-FTIR Spectroscopy Combined with Chemometric Me DOI: 10.21203/rs.3.rs-905784/v1 -
zaupanje 0,9
“band around ~1805 cm-1 for Pd/SSZ-13 belonged to Pd(I)-NO”
The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion DOI: 10.1016/j.jcat.2010.07.031.
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