What absorbs at 1145 cm⁻¹ in an FTIR spectrum?
A band near 1145 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
Ateb cyflym
A band near 1145 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.
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| C-O single bond | 18 | 18 | 1.0 |
| Methoxy (OCH3) | 17 | 17 | 1.0 |
| Methacrylate | 17 | 17 | 1.0 |
| Acetate | 17 | 17 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Deunyddiau posibl
| Deunydd | Copaon ategol | Grwpiau sy＇n gorgyffwrdd | Ffynonellau a ddyfynnwyd |
|---|---|---|---|
| PMMA | 1145, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Mae deunyddiau＇n cael eu dangos dim ond pan fydd yr un gronfa lenyddiaeth yn cefnogi＇r band hwn ac o leiaf un brig nodweddiadol ychwanegol.
Rhesymeg sbectrwm
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 1145 cm⁻¹ is usually not enough for material identification by itself.
Defnydd yn y byd go iawn
Mae＇r math hwn o ymholiad yn gyffredin mewn adnabod polymer, sgrinio plastig anhysbys, datrys problemau QC, dilysu deunydd wedi＇i ailgylchu, ac adolygiad o aseiniad copa wedi＇i gefnogi gan lenyddiaeth.
Camgymeriadau cyffredin
- Trin un band ynysig fel prawf o ddeunydd heb wirio o leiaf un neu ddau gopa cefnogol.
- Anwybyddu gorgyffwrdd: gall grwpiau swyddogaethol lluosog gyfrannu ger yr un rhif ton.
- Hepgor dilysu pan fo ychwanegion, cymysgeddau, ocsideiddio, neu halogiad yn gallu ystumio＇r sbectrwm.
Cyngor dilysu
Pan fo amwysedd yn parhau, dilyswch y rhagdybiaeth gyda DSC, GC-MS, neu TGA, yn enwedig ar gyfer cymysgeddau, samplau dirywiedig, a pholymerau llawn.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
-
Acetate hyder 1.0
“Zhou, Limin Wu, Polymer 122-129 4 C-O stretching vibrations 1145 (2011).”
Kumar 和 Sidhu - 2013 - Synthesis and Characterization of PMMA-ZrO2 Nanoco DOI: 10.1063/1.4810163 -
Amide hyder 1.0
“stretching (1534 and 1381 C-O and C-N stretching (1145 and 1013 The RA-CPTMS/TiO composite 2 materials showed both characteristic peaks of TiO and the red amaranth extract, indicating the successful 2”
Kurniawan 等 - 2019 - Selective Betalain Impregnation from Red Amaranth DOI: 10.1063/1.5134613 -
Aromatic ring hyder 1.0
“The 1145cm-1 1080cm-1 absorption peak at and corresponded to the benzene ring =C-H bending vibration 916cm-1 in the plane.”
Li 等 - 2011 - The detection of Cypermethrin on the surface of Ap DOI: 10.4028/www.scientific.net/AMR.287-290.2991 -
Acetate hyder 1.0
“In the glycerol cm(cid:1)1 spectra, the peak intensities at about 1145 and 962 are responsible for C-O stretching [27].”
Interactions between polyols and wheat biopolymers in a bread model system fortified with inulin: A Fourier transform infrared study DOI: 10.1016/j.heliyon.2018. -
Phosphate (PO4) hyder 1.0
“Peaks formed at 1145 cm-1 might also be due to the PO2 group vibration of the phospholipids present in the cold pressed walnut oil.”
Walnut Oil Oleogels as Milk Fat Replacing System for Commercially Available Chocolate Butter DOI: 10.3390/gels8100613 -
Acetate hyder 1.0
“Three -C-O-Cpeaks appear at 1145, 1116, and cm-1, ular segments.”
Yang 等 - 2015 - Effect of molecular weight on conformational chang DOI: 10.1007/s10853-014-8714-1 -
Water (H2O) hyder 1.0
“Therefore, the peak position at 1145 of between SO and water molecules are only slightly weaker 42V the band of SO may be related to MgSO gels present as than those between water molecules, the formation of SIPs (and”
Zhao 等 - 2006 - Magnesium sulfate aerosols studied by FTIR spectro DOI: 10.1021/jp055291i -
Amide hyder 1.0
“[46], the peak at 1145 the amide band that accounts for the peak at 1236 cm-1[45].”
Antibacterial Activity of the Green Synthesized Plasmonic Silver Nanoparticles with Crystalline Structure against Gram-Positive and Gram-Negative Bacteria DOI: 10.3390/nano13081327
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.