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
Snabbt svar
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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| 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 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Spektrumlogik
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.
Användning i verkligheten
Denna typ av fråga är vanlig inom polymeridentifiering, screening av okänd plast, felsökning av kvalitetskontroll, verifiering av återvunnet material och litteraturstödd toppidentifieringsgranskning.
Vanliga misstag
- Behandla ett isolerat band som bevis på ett material utan att kontrollera minst en eller två stödjande toppar.
- Ignorerar överlapp: flera funktionella grupper kan bidra nära samma vågtal.
- Hoppa över validering när tillsatser, blandningar, oxidation eller föroreningar kan förvränga spektrat.
Verifieringsråd
När oklarhet kvarstår, validera hypotesen med DSC, GC-MS eller TGA, särskilt för blandningar, nedbrutna prover och fyllda polymerer.
Litteratur bakom dessa identifieringar
-
förtroende 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 förtroende 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 förtroende 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 -
förtroende 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 förtroende 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 förtroende 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) förtroende 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 -
förtroende 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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