What absorbs at 665 cm⁻¹ in an FTIR spectrum?
A band near 665 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 665 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 | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,85 |
| Alkene (C=C) | 1 | 1 | 0,8 |
| Sulfur | 1 | 0 | 1,0 |
| Thiol | 1 | 0 | 0,9 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| Chitosan | 665, 1650, 1655 | Alkyl C-H, Hydroxyl (O-H), N h | 2 |
| ZnO | 665, 1400, 3430 | Hydroxyl (O-H), Alkyl C-H | 1 |
| sodium alginate | 665, 1636, 1080 | Hydroxyl (O-H), 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 665 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
-
pārliecība 1,0
“Er3+ with increasing the concentration of ions in the glass (300-665cm-1) termediate region which is ascribed to deformation of ΔT (>100°C) as well the higher values (which are higher than other the vibrational modes of the glass network wi”
Structural and optical properties of TeO2-Li2O-ZnO-Nb2O5-Er2O3 glass system DOI: 10.1016/j.jnoncrysol.2018.08.011 -
pārliecība 1,0
“assigned to chain axis O(3) vibrations”
Khan 等 - 2004 - Effects of post-annealing on the infrared active p DOI: 10.1016/j.physc.2004.04.029 -
Metal oxygen pārliecība 1,0
“665cm-1 confirmed Zn-O stretching vibrations A broad band at (2.5% Mn-doped ZnO), 3.61eV (5% Mn-doped ZnO), and (Almehizia et al., 2021).”
Khan 等 - 2022 - Microwave-Assisted Green Synthesis of Pure and Mn- DOI: 10.3389/fmats.2021.710155 -
Alkyl C-H pārliecība 1,0
“The obvious peaks at 2926 and 2859 cm-1 correspond to organic compounds that cm-1 cm-1 The flattened peak at 1422 and the medium one at 665 are attributed to The flattened peak at 1422 cm-1 and the medium one at 665 cm-1 are attributed to c”
Technological and Functional Approaches Applied to Miniature Vessels with Pigment Traces: Two Middle Bronze Age Case Studies from Eastern Subcarpathians of Romania DOI: 10.3390/app13042093 -
Hydroxyl (O-H) pārliecība 1,0
“amide-IV al.14 et by Gonzaga The broad and strong band located 665 amide-V cm-1 between 3490 and 3256 in the FTIR spectrum is attributed to the axial stretching of the O-H and N-H”
Gonzaga 等 - 2020 - Chitosan and Agaricus brasiliensis Polysaccharides DOI: 10.21577/0103-5053.20190264 -
pārliecība 1,0
“The A magnification of this eV region cm-1 N-H peak observed at 665”
Gurumendi 等 - 2023 - Enhanced Chitosan Photoluminescence by Incorporati DOI: 10.1021/acsomega.2c08072 -
Ring structure pārliecība 1,0
“The peak at 665 is assigned to out of plane vibrations involving ring structures (Jaouadi, M'sahli & Sakli, 2009), cm-1 the peak at 894 can be attributed to the presence of b-glycosidic linkages between the monosaccharides (Reddy, Ashok, Re”
Maache 等 - 2017 - Characterization of a novel natural cellulosic fib DOI: 10.1016/j.carbpol.2017.04.096 -
Alkyl C-H pārliecība 1,0
“cm-1 The absorption at 1352 corresponding to the stretching,40 vibration of S=O and the presence of fucoidan Composite films sodium alginate-based elaborated cm-1 reported.41 sulfate groups at 835 was Also, the band cm-1 around 665 is attri”
Villacres 等 - 2023 - Preparation of Composite Films of Sodium Alginate- DOI: 10.21577/0103-5053.20230064
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