What absorbs at 968 cm⁻¹ in an FTIR spectrum?
A band near 968 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 968 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 |
|---|---|---|---|
| Alkyl C-H | 6 | 6 | 1,0 |
| Alkene (C=C) | 4 | 4 | 1,0 |
| Phosphate (PO4) | 3 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Nitro (NO2) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| PVC | 968, 834, 1195 | Alkyl C-H | 1 |
| saliva | 968, 1648, 1664 | Alkyl C-H | 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 968 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
-
Amide pārliecība 1,0
“2000cm-1, 1.21mgg-1 baseline established in for a ChlorThe absorption bands of Chlorpyrifos are located at 1549, pyrifosstandardandthenoisemeasuredinthesameregionfor 968cm-1, 1412, 1339, 1165, 1088, 1025 and due to C N a blank spectrum and”
Armenta 等 - 2005 - A validated and fast procedure for FTIR determinat DOI: 10.1016/j.talanta.2005.03.008 -
Alkene (C=C) pārliecība 1,0
“and quantified by using Fourier-transform infrared (FTIR) spectroscopy, in the mid-region of 400-4000 cm-1, The FTIR analysis shows that two oil extracts (with and without heat) present a well-defined peak at 968 which represents the double”
Ariza Ortega 等 - 2012 - Analysis of trans fatty acids production and squal DOI: 10.2478/s11532-012-0104-4 -
pārliecība 1,0
“cm(cid:1)1, cm(cid:1)1, cm(cid:1)1 Ti-BEA shows clear peaks at 968 960 and 943 as previously described [20].”
Effect of water treatment on Sn-BEA zeolite: Origin of 960 cm-1 FTIR peak DOI: 10.1016/j.micromeso.2015.02.012 -
Acetate pārliecība 1,0
“1033 -C-O Stretching Phospholipid w w w w - 968 Bending (out of plane) Phosphatidylcholine w w m m m -CH = CH-(trans)”
Gao 等 - 2017 - Technical note Characterization of lipid constitu DOI: 10.2527/jas2016.1332 -
Acetate pārliecība 1,0
“-b 19 1072-1043 -C-O Stretching 1033a 20 1043-1006 -C-O Stretching -HC@CH968a 21 1006-929 (trans)”
Rapid evaluation of oxidised fatty acid concentration in virgin olive oil using Fourier-transform infrared spectroscopy and multiple linear regression DOI: 10.1016/j.foodchem.2010.06.054 -
Alkyl C-H pārliecība 1,0
“2 to 2922 cm-1 (as shown in Figure 4b) and 2921 cm-1 (as indicated in Figure 4c) in the hydrochar, while cm-1 cm-1 shifted to 2922 (as shown in Figure 4b) and 2921 (as indicated in Figure 4c) in the hydrochar, the skeletal vibration at 1255”
Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256 -
Alkyl C-H pārliecība 1,0
“the peak of 1655.00 the olefinic C-H out of plane bending vibration at the band of 968.22 cm-1 Furthermore, the peak at 3082.50 corresponds to the =C-H stretching vibrations of both the allyl group and the cm-1 aromatic ring, whereas the ab”
Tan 等 - 2018 - Synthesis and Characterization of Polybenzoxazine DOI: 10.1063/1.5066866 -
Alkene (C=C) pārliecība 1,0
“On the other hand, carboxymethyl-ethanolamine was cm-1 968 which is a marker peak of trans double bonds in [26] as a biomarker of phospholipid modification during reported unsaturated fatty acids [14] which may be formed mainly after the Ma”
Optical screening of diabetes mellitus using non-invasive Fourier-transform infrared spectroscopy technique for human lip DOI: 10.1016/j.jpba.2012.12.009
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