What absorbs at 623 cm⁻¹ in an FTIR spectrum?
A band near 623 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 623 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 |
|---|---|---|---|
| Sulfate (SO4) | 2 | 1 | 1,0 |
| Perchlorate | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
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 623 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
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Vertrauen 1,0
“The RCA-cleaned Si wafer Agþ e(cid:3) Ag ðEq 1Þ þ ¼ shows three major vibrational peaks at 623, 1108 and cm(cid:3)1.”
Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z -
Amide Vertrauen 1,0
“The additional USC peak at 1,623 cm-1 in the FNT-FA sample is assigned to vibration of the amide II band that includes C-N stretching of the new amide bond formed between amine group of FNTs and -1 carboxylic group from FA.”
Covalent diphenylalanine peptide nanotube conjugated to folic acid/magnetic nanoparticles for anti-cancer drug delivery DOI: 10.1016/j.jddst.2017.06.005 -
C-S single bond Vertrauen 1,0
“LLM confirmed rule peak-group candidate”
The Influence of Initiator Concentration on Selected Properties of Thermosensitive Poly(Acrylamide-co-2-Acrylamido-2- Methyl-1-Propanesulfonic Acid) Microparticles DOI: 10.3390/polym -
Vertrauen 1,0
“The absorption peaks at 623.01.29, 503.42 and conditions were compared with the standard (control) chrocm-1 corresponded to the Fe bond vibration of Fe 447.49 matogram and the degraded products produced during the nanoparticles.”
Enhanced degradation of indeno(1,2,3-cd)pyrene using Candida tropicalis NN4 in presence of iron nanoparticles and produced biosurfactant: a statistical approach DOI: 10.1007/s13205-019-1623-x -
Metal oxygen Vertrauen 1,0
“For desorption studies, 10 mL of NaOH cm(cid:1)1 material.64 group in the The bands peaking at 623 and solution (0.5 M) was added to the ampicillin loaded PDA/ZI 3.0 cm(cid:1)1 Zr-O vibration.65 482 are linked to lattice The peak (0.06 g).”
Assessment of ampicillin removal efficiency from aqueous solution by polydopamine/zirconium(iv) iodate: optimization by response surface methodology DOI: 10.1039/d0ra02061c -
Perchlorate Vertrauen 1,0
“In these inset plots, the intensity of bands at 623 assigned to the free anion was normalized to band intensities that do not depend on the lithium perchlorate concentration.”
Plasticizers and Salt Concentrations Effects on Polymer Gel Electrolytes Based on Poly (Methyl Methacrylate) for Electrochemical Applications DOI: 10.3390/gels8060363 -
Sulfate (SO4) Vertrauen 1,0
“Meenatchisundaram et al., 2014) and tonsoncarboninαpositiontocarboxylgroups,whichmightconfirmthe cm-1 the band at 623 can be attributed to sulfate (Ai et al., 2019;”
Comprehensive characterization of industrial wastewaters using EEM fluorescence, FT-IR and 1H NMR techniques DOI: 10.1016/j.scitotenv.2021.150417 -
Vertrauen 0,9
“Explicit assignment in text.”
Plata Lievano 和 Carreno Diaz - 2016 - Synthesis and Characterization of 1-Methyl-3-Metho DOI: 10.1590/1980-5373-MR-2015-0561
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