What absorbs at 3625 cm⁻¹ in an FTIR spectrum?
A band near 3625 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 3625 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 0,9 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0,8 |
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 |
|---|---|---|---|
| clay | 3625, 1736, 2855 | Hydroxyl (O-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 3625 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
-
Hydroxyl (O-H) Vertrauen 1,0
“Interpretation and discussion 3625cm-1 O-H-stretching frequencies near the band.”
The nature of interlayering in clays from a podzol (Spodosol) from the Tatra Mountains, Poland DOI: 10.1016/j.geoderma.2010.10.013 -
Hydroxyl (O-H) Vertrauen 1,0
“As shown in the clay spectra of RC, cm-1, NaC and OC, there are absorption bands at the frequencies 3626, 3629, and 3625 which refer to the stretching vibrations of the (O-H) bonds in Al-OHs, respectively, and”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372 -
Vertrauen 1,0
“cm-1 Moreover, the appearance of a new band at 3625 was due to formation of Mn-O(H)-Si moieties (Scheme 1, Structure C), similar to acidic hydroxyl groups typical for zeolite materials.”
Incorporation of Mn into the vacant T-atom sites of a BEA zeolite as isolated, mononuclear Mn: FTIR, XPS, EPR and DR UV-Vis studies DOI: 10.1039/c6cp01713d -
Hydroxyl (O-H) Vertrauen 1,0
“The band at cm-1 Methylene blue (Sigma-Aldrich) was used in the adsorption study 3625 was assigned to the stretching vibration of structural OH 448cm-1were purification.”
Sodium montmorillonite/ureasil-poly(oxyethylene) nanocomposite as potential adsorbent of cationic dye DOI: 10.1016/j.clay.2017.11.009 -
Silanol (Si-OH) Vertrauen 1,0
“diatomite presented distinctive bands at 3625, 1633, 1433, 1043, 795 and 448 The cm-1 was due to the free silanol group (SiO-H) (Khraisheh et al., 2005;”
El Ouardi 等 - 2020 - An insight of enhanced natural material (calcined DOI: 10.1016/S0043-1354(01)00071-9 -
Vertrauen 1,0
“Fine particles of RHA, slag, and spherical particles Cem3,4,and5mortars.Thebandat3822cm-1 or3625cm-1 ofFAfillthesmallporesofZ-Cemandconsequentlyincrease may be due to the presence of calcium hydroxide.”
Karim 等 - 2015 - Development of a Zero-Cement Binder Using Slag, Fl DOI: 10.1155/2015/247065 -
Water (H2O) Vertrauen 1,0
“2355.9702 Atmospheric CO 2 3432.0896 Adsorbed water vibrations (H-O-H) 3624.6269 Inner OH groups, lying between the sheets of tetrahedral and octahedral units”
Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays DOI: 10.3390/nano12142332 -
Hydroxyl (O-H) Vertrauen 1,0
“the characteristic peak near 1535 in the spectrum 3 FTIR spectra of NHA, 3752 cm-1 and 3625 cm-1 are the stretching vibrations of -OH with”
Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite DOI: 10.3390/min12111341
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