What absorbs at 1119 cm⁻¹ in an FTIR spectrum?
A band near 1119 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
Ātra atbilde
A band near 1119 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Carbonate | 1 | 0 | 0,5 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| polypyrrole | 1119, 1700, 400 | Alkyl C-H, Methacrylate, Acetate | 1 |
| silver nanoparticles | 1119, 1636, 1631 | Alkyl C-H, Methacrylate, Acetate | 1 |
| cotton | 1119, 1030, 1638 | Alkyl C-H, Methacrylate, Acetate | 1 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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 1119 cm⁻¹ is usually not enough for material identification by itself.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
C-O single bond pārliecība 1,0
“5, the TSX spectra showed a C-O-C band at 1156 and a cm-1 small broad peak at 1119 assigned to the C-OH as previously described [35].”
Sangfai 等 - 2015 - Preparation and characterization of kappa-carragee DOI: 10.1007/s00289-015-1360-1 -
Acetate pārliecība 1,0
“The band at 1119 M cm-1 is due to the C=O stretching modes arising from the absorption of atmospheric CO on the surface of the nanocrystals.”
Photovoltaic and Antimicrobial Potentials of Electrodeposited Copper Nanoparticle DOI: 10.1016/j.bej.2018.10.009 -
Phosphate (PO4) pārliecība 1,0
“AC 720cm-1 748cm-1are to associated with the stretching vibration of bridging oxygen cm-1 [17,21].The bands at around 790-815 are due to symmetric stretching vibrations of Pcm-1 1012cm-1 O-P rings [22] .The bands lie around at 1000 to are a”
Yaacob 等 - 2018 - Comprehensive study on compositional modification DOI: 10.1016/j.solidstatesciences.2018.05.006 -
Acetate pārliecība 1,0
“cm-1 cm-1 characteristics for two adjacent bands of 1119 and 1096 attributed to C-O stretching (ester cm-1 cm-1, group) among these oils.”
Han 等 - 2020 - Rapid Classification and Quantification of Camelli DOI: 10.3390/molecules25092036 -
Acetate pārliecība 1,0
“1020cm-1 corresponded to the functional The band at Similarly, functional groups such as -C-O-O-, -C-O-, 1119cm-1 corregroup C-O;”
Lakshmi 等 - 2015 - Reduction of Silver Ions by Cell Free Extracts of DOI: 10.1155/2015/539494 -
Alkyl C-H pārliecība 1,0
“The peak assignedto the C-H stretchingvibration in C-O-CH cm-1canbeassignedtotheC-Ostretching vibrationin at1119 Tablet preparation and characterization cm-1”
Formulation and evaluation of primaquine phosphate taste?masked rapidly disintegrating tablet DOI: 10.1211/jpp/60.10.0003 -
Alkyl C-H pārliecība 1,0
“The band at 1119 is due cm-1 to in-plane C-H bending modes.”
PANI/TiO<sub>2</sub> nanocomposite‐based chemiresistive gas sensor for the detection of <i>E. Coli</i> bacteria DOI: 10.1049/iet-nbt.2020.0046 -
Alkyl C-H pārliecība 1,0
“deformation vibration is shown by peaks at 1047 The cm(cid:3)1 C-H peak at 1119 is attributed to in and out of plane N-C ]C-H deformations.”
A novel flexible sensor for respiratory monitoring based on in situ polymerization of polypyrrole and polyurethane coating DOI: 10.1039/c7ra08331a
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