What absorbs at 1259 cm⁻¹ in an FTIR spectrum?
A band near 1259 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
Brzi odgovor
A band near 1259 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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Methoxy (OCH3) | 9 | 9 | 1,0 |
| Methacrylate | 9 | 9 | 1,0 |
| Acetate | 9 | 9 | 1,0 |
| C-O single bond | 8 | 8 | 1,0 |
| Alkyl C-H | 5 | 3 | 1,0 |
| Ring structure | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Silicon carbon | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 0,7 |
| Hydrogen bond | 1 | 0 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| chitosan | 1259, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 2 |
| polystyrene | 1259, 1020, 1600 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan 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 1259 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
S eq o pouzdanost 1,0
“The author's thanks to Ministry of 1259cm-1 corresponds to S=O bonds.”
Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43 -
Alkyl C-H pouzdanost 1,0
“Results and discussion cm-1 Si\CH at 1259.4 due to CH symmetric stretching of 3, at 3”
Ferreira 等 - 2013 - Surface modification of poly(dimethylsiloxane) by DOI: 10.1016/j.surfcoat.2013.02.035 -
C c single bond pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Preparation, Characterization and Antibacterial Evaluation of Soy Protein Isolate Biopolymeric Films Loaded with Nalidixic Acid DOI: 10.1007/s10924-020-01729-4 -
Acetate pouzdanost 1,0
“Similarly, the peak positions cor1259 wt% 4HF polymer on the ionic conductivity of PEO-10 NH 2 responding to C¼O stretching, C-O-C stretching, and”
Influence of high and low dielectric constant plasticizers on the ion transport properties of PEO: NH4HF2 polymer electrolytes DOI: 10.1177/0954008319894043 -
Acetate pouzdanost 1,0
“In genThe cm-1, 1412 and 1423 the C-O stretching of aromatic ring's ether eral, the exchange process between the new and exchangeable cm-1 at 1259 and, the vibrations of aromatic ring (C C) at 1531 cations did not exhibit significant differ”
Tabak 等 - 2011 - Structural analysis of naproxen-intercalated bento DOI: 10.1016/j.cej.2011.09.027 -
Amide pouzdanost 1,0
“1317.31 1298.03 C-N stretching vibrations of amide III 1259.45 1256.60 1256.60”
Physicochemical Properties and Functional Characteristics of Ecologically Extracted Shrimp Chitosans with Different Organic Acids during Demineralization Step DOI: 10.3390/molecules27238285 -
Lignin pouzdanost 1,0
“cm-1, (2) Bands at 1259 assigned to syringyl ring and C-O stretch in lignin and xylan as reported cm-1 (attributed to amide III) (Fig.”
Erukhimovitch 等 - 2010 - Direct identification of potato's fungal phyto-pat DOI: 10.3233/SPE-2010-0483 -
Alkyl C-H pouzdanost 1,0
“The characteristic band at 1259 assigned to the CH 2Cl wagging was only present in the spectra of PSVBC-30 but absent in the other spectra [27].”
Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications DOI: 10.3390/membranes11110901
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