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
Stutt svar
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.
Mögulegar úthlutun virkra hópa
| Virkur hópur | Stuðningsstaðreyndir | Tilvitnuð heimildir | Mesta öryggi |
|---|---|---|---|
| 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 |
Röðun endurspeglar uppsöfnuð ritrýnisgögn, ekki eina valdboðsreglu. Staðfestu alltaf í samhengi við sýnið þitt.
Möguleg efni
| Efni | Stuðningstindar | Skarast hópar | Tilvitnuð heimildir |
|---|---|---|---|
| polyethylene | 1805, 1737, 1720 | Hydroxyl (O-H) | 1 |
| HDPE | 1805, 1369, 1216 | Hydroxyl (O-H) | 1 |
Efni birtast aðeins þegar sama bókmenntasafn styður þessa band og að minnsta kosti einn viðbótar einkennandi hámark.
Rófrök
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.
Raunveruleg notkun
Þessi tegund fyrirspurna er algeng við auðkenningu fjölliða, skimun óþekktra plasttegunda, bilanaleit í gæðaeftirliti, staðfestingu endurunnins efnis og bókmenntabakkaða endurskoðun á hápunktum.
Algeng mistök
- Meðhöndla eina einangraða öldulengd sem sönnun á efni án þess að athuga að minnsta kosti einn eða tvo stuðningstoppa.
- Hunsa skörun: mörg virkir hópar geta lagt sitt af mörkum nálægt sömu bylgjutölunni.
- Að sleppa staðfestingu þegar aukefni, blöndur, oxun eða mengun geta brenglað litrófið.
Staðfestingarráðgjöf
Þegar tvíræðni er eftir, staðfestu tilgátuna með DSC, GC-MS eða TGA, sérstaklega fyrir blöndur, niðurbrotin sýni og fylltar fjölliður.
Ritlist á bak við þessar úthlutanir
-
öryggi 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) öryggi 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 öryggi 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) öryggi 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 -
öryggi 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.
Ertu með róf með þessu bandi?
Hladdu upp FTIR-rófinu þínu og fáðu fulla túlkunarskýrslu — toppúthlutun með tilvitnunum í ritrýni, bókasamsvörun og sönnunarkeðju með öryggismati — á nokkrum sekúndum.