What absorbs at 1229 cm⁻¹ in an FTIR spectrum?
Et bånd nær 1229 cm⁻¹ kan peke på flere funksjonelle grupper. Nedenfor er de mest sannsynlige tildelingene, rangert etter hvor mye publiserte bevis som støtter hver — hver enkelt sporbar til litteratur (DOI) og kryssvalidert mot våre 130 000+ referansespektre og kunnskapsgraf.
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Raskt svar
A band near 1229 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 funksjonelle gruppe-tilordninger
| Funksjonell gruppe | Støttende fakta | Siterte kilder | Toppkonfidens |
|---|---|---|---|
| C-O single bond | 9 | 9 | 1.0 |
| Methacrylate | 9 | 9 | 1.0 |
| Acetate | 9 | 9 | 1.0 |
| Methoxy (OCH3) | 8 | 8 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Carbon bromine | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 1.0 |
Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.
Mulige materialer
| Materiale | Støttetopper | Overlappende grupper | Siterte kilder |
|---|---|---|---|
| alginate | 1229, 1100, 1715 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Materialer vises kun når samme litteraturbase støtter dette båndet og minst en annen karakteristisk topp.
Spektrum-logikk
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 1229 cm⁻¹ is usually not enough for material identification by itself.
Virkelig bruk
Denne typen forespørsel er vanlig i polymeridentifikasjon, screening av ukjent plast, feilsøking i kvalitetskontroll, verifisering av resirkulert materiale og litteraturstøttet gjennomgang av topptilordning.
Vanlige feil
- Behandle ett isolert bånd som bevis på et materiale uten å sjekke minst en eller to støttende topper.
- Ignorerer overlapping: flere funksjonelle grupper kan bidra nær samme bølgetall.
- Hopp over validering når tilsetningsstoffer, blandinger, oksidasjon eller forurensning kan forvrenge spekteret.
Verifiseringsråd
Når tvetydighet gjenstår, valider hypotesen med DSC, GC-MS eller TGA, spesielt for blandinger, nedbrutte prøver og fylte polymerer.
Litteratur bak disse tilordningene
-
Hydroxyl (O-H) konfidens 1.0
“of peak changes in wavenumber for alginate-GA in BBPEs system (cm-1) Assignments (functional group) Wavenumber GA ALGAALGAALGAALGAALGAALGAALGA0 1 2 3 4 5 6 - C-O-C 1025 1030 1031 1035 1035 1080 1081 stretching - - - - - - - 1074 C-O stretch”
Enhancing proton conductivity of sodium alginate doped with glycolic acid in bio-based polymer electrolytes system DOI: 10.1007/s10965-020-02142-0 -
Acetate konfidens 1.0
“Meanwhile, the peaks at 1229 and 1070 are assigned to C-O and C-O-C stretching vibrations cm-1 from urethane carbonyl.”
Preparation of one-shot and two-shot method of semi-rigid polyurethane film based on functionalized liquid natural rubber DOI: 10.1063/1.5047200 -
Acetate konfidens 1.0
“The bands at 1229 and cm-1 samples was examined immediately after the sam1062 are assigned to C-O and C-O-C stretching ples were removed from the media before they were vibrations from urethane carbonyl [9].”
The behavior of semi-rigid polyurethane film based on functionalized rubber by one-shot and two-shot method preparation DOI: 10.1007/s10853-018-2578-8 -
Carboxyl (COOH) konfidens 1.0
“The degree of stretching vibration mode of the carboxylic group (C-O) corresponding to the peaks at 1229, 1217, 1215, 1073, cm-1 1071 and 1068 of all as-burnt BCZT powders decreased with increasing pH value.”
Influence of pH values on the surface and properties of BCZT nanopowders synthesized via sol-gel auto-combustion method DOI: 10.1016/j.surfcoat.2016.03.091 -
C-O single bond konfidens 1.0
“LLM confirmed rule peak-group candidate”
Graphene oxide-TiO2 and reduced graphene oxide-TiO2 nanocomposites: Insight in charge-carrier lifetime measurements DOI: 10.1016/j.cattod.2016.11.008 -
konfidens 1.0
“cm(cid:0) C-- 1, 8400 automatic nitrogen determination apparatus (FOSS, Hiller, which correspond to the O stretching vibra1229, and 1059 C(cid:0) (cid:0) (cid:0) C(cid:0) O(cid:0) Denmark) in the Kjeldahl mode.”
Preparation of pH-sensitive polylactic acid-naringin coaxial electrospun fiber membranes for maintaining and monitoring salmon freshness DOI: 10.1016/j.ijbiomac.2021.08.087 -
Acetate konfidens 1.0
“hydrogen bonded hydroxyl groups (3600-3200 cm-1 The standard has a very strong band at 1737 that is assigned to C=O cm-1 that corresponds to in-plane stretching of COOH group and a band at 1229 bending vibrations of OH groups from COOH (Fig”
Miletic 等 - 2020 - Oxidized humic acids from the soil of heat power p DOI: 10.2298/JSC190726099M -
Amide konfidens 1.0
“LLM confirmed rule peak-group candidate”
Direct Quantification of Drug Loading Content in Polymeric Nanoparticles by Infrared Spectroscopy DOI: 10.3390/pharmaceutics12100912
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