S eq o — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

S eq o tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.

Karakteristiske FTIR-toppe for S eq o

Viser de 30 bedst understøttede toppe ud af 184 i alt for S eq o.

Spektrumlogik

En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.

Anvendelse i virkeligheden

Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.

Almindelige fejl

• Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
• Antager, at det stærkeste bånd altid er det mest diagnostiske.
• At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.

Verifikationsrådgivning

Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.

Litteratur bag disse tildelinger

• 1255 cm⁻¹ tillid 1,0

  “OH group 1593 CH bending 1240 S=O stretching 1255”

  Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43
• 1035 cm⁻¹ tillid 1,0

  “FTIR showed peak at 26 cm-1 1035 which corresponded to O=S=O stretching of sulphonic (-SO 3H) group.”

  Balan 等 - 2021 - Esterification of residual palm oil using solid ac DOI: 10.1016/j.jtice.2012.07.001.
• 1130 cm⁻¹ tillid 1,0

  “The bands around 1130 and 1150cm(cid:1)1 are due to the symmetric SO stretching and SO 2”

  Synergistic effect of copolymers composition on the electrochemical, thermal, and electrical behavior of 5-lithiosulphoisophthalic acid doped poly(aniline-co-2-isopropylaniline): synthesis, characterization, and applications DOI: 10.1002/pat.1359
• 1163 cm⁻¹ tillid 1,0

  “The peak at 1163 cm-1 in the CNC spectrum revealed the presence of a sulphated group (SO2) cm-1”

  Isolation and Characterization of Cellulose Nanocrystals from Oil Palm Mesocarp Fiber DOI: 10.3390/polym9080355
• 1318 cm⁻¹ tillid 1,0

  “(cm(cid:3)1) Band Vibration mode Main attribution Raw material Standard b-D-glucan M26/08 M49/07 M23/08 C@O 1647 v Conjugated carbonyl 1648 1655 1655 1646 CAH das 1445 CH3, CH2 1431 1436 1431 1420 CAH ds 1379 CH3 1374 1375 1375 1377 SAO 135”

  Choong 等 - 2014 - Identification of geographical origin of Lignosus DOI: 10.1016/j.molstruc.2014.04.001
• 1168 cm⁻¹ tillid 1,0

  “In the heparin-modified sample, there are peaks around 1168 cm-1 and 1240 cm-1, which correspond to the S-O and S=O bands.”

  Surface Heparinization of a Magnesium-Based Alloy: A Comparison Study of Aminopropyltriethoxysilane (APTES) and Polyamidoamine (PAMAM) Dendrimers DOI: 10.3390/jfb13040296
• 1651 cm⁻¹ tillid 1,0

  “Meanwhile, the presence of the peak at the 1651 cm-1, were assigned asymmetric O=S=O sulfonic group in SPEEK was confirmed by the sharp peak at 1024.13 cm-1, which were stretching vibration.”

  Hasbullah 等 - 2016 - Synthesis and Characterizations of Electrospun Sul DOI: 10.1063/1.4948867
• 1250 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Sulfated polysaccharides (fucoidan) from the brown seaweed Silvetia compressa (J. Agardh) E. Serrão, T.O. Cho, S.M. Boo & Brawley DOI: 10.1007/s10811-019-01870-1