What absorbs at 1209 cm⁻¹ in an FTIR spectrum?

Brzi odgovor

A band near 1209 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.

Moguće dodjele funkcionalnih skupina

Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.

Mogući materijali

Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.

Logika spektra

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 1209 cm⁻¹ is usually not enough for material identification by itself.

Upotreba u stvarnom svijetu

Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.

Uobičajene pogreške

• Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
• Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
• Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.

Savjet za provjeru

Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.

Literatura iza ovih dodjela

• Acetate pouzdanost 1,0

  “The peaks at 1209, 1088, and 833 demonoftheprocess.AccordingtoRoyetal.(2008),alkanes,fattyacids,and strated C-O stretching of the alkyl aryl group, C-N stretching of substances with ester groups were found due to biodegradation by the amine”

  Characterization of plastic degrading bacteria isolated from sewage wastewater DOI: 10.1016/j.sjbs.2023.103628
• Imide pouzdanost 1,0

  “FTIR(KBr, 1772, 1720(imideIgroup)1507(stretchingoftrisubstitutedbenzenering), 1386 (imide II, CN stretching), 1209 (COC antisymmetric stretching), 929 (out-of-plane CH bending).”

  Corrosion Resistance of Mild Steel Coated with Phthalimide-Functionalized Polybenzoxazines DOI: 10.3390/coatings10111114
• Hydroxyl (O-H) pouzdanost 1,0

  “The vibration peak at around 1460 is assigned to scissoring modes cm-1 cm-1 of CH 2, and the peaks at 1343 and 1278 to rocking vibration modes of CH [48], 2 cm-1 while the vibration peak at 1209 is indicative of the OH deformation asymmetri”

  Stabilization of Dry Sucrose Glasses by Four LEA_4 Proteins from Arabidopsis thaliana DOI: 10.3390/biom11050615
• Silicon (Si) pouzdanost 1,0

  “The spectra show the peak associated with the TO vibration mode of the asymmetric stretch of Si-O-Si bonds located at 1088 cm-1, and the shoulder at approximately 1209 cm-1 is assigned to the LO vibration mode of SiO-Si.”

  Mocioiu 等 - 2021 - Effect of ZnO on Properties of Gels for Heritage O DOI: 10.3390/gels7040251
• Amide pouzdanost 1,0

  “Concurrently, the band of 1209 cm-1 in AgNPs (which was cm-1 2shifted from 1224 in cell biomass) corresponds to C-N stretching and PO asymmetric stretching.”

  Microbial Mediated Synthesis of Silver Nanoparticles by Lactobacillus plantarum TA4 and Its Antibacterial and Antioxidant Activity DOI: 10.3390/app10196973
• Acetate pouzdanost 1,0

  “at 1209 would be due to the stretching vibration of (O-CH3);”

  Oliveira 等 - 2016 - FTIR analysis and quantification of phenols and fl DOI: 10.1590/S1517-707620160003.0072
• pouzdanost 0,7

  “Assigned to macrocycle 3.”

  Self-Healing Thiolated Pillar[5]arene Films Containing Moxifloxacin Suppress the Development of Bacterial Biofilms DOI: 10.3390/nano