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
Schnelle Antwort
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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| 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 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| 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 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Vertrauen 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 -
Vertrauen 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 Vertrauen 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 Vertrauen 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) Vertrauen 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 -
Vertrauen 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 Vertrauen 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 Vertrauen 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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