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
Ātra atbilde
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
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 623 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
“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 pārliecība 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 pārliecība 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 -
pārliecība 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 pārliecība 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 pārliecība 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) pārliecība 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 -
pārliecība 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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