Water (H2O) — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Water (H2O) 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 Water (H2O)

Viser de 30 bedst understøttede toppe ud af 735 i alt for Water (H2O).

Mulige materialer

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

• 3390 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Ashraf 等 - 2021 - Identification and properties of ion-pairs in the DOI: 10.1016/j.molliq.2020.114891
• 1993 cm⁻¹ tillid 1,0

  “Microstructure of extrudates & bonding forces thereby favoring water absorption (Lim Seib, 1993).”

  Encapsulating probiotics in novel resistant starch wall material for production of rice flour extrudates DOI: 10.1016/j.lwt.2020.110839
• 3258 cm⁻¹ tillid 1,0

  “hydroxyl group stretching is observed at 3258 This is due to the interaction of OH group in water by H bond which is observed as a stretching mode.”

  Synthesis and Characterization of Zinc Oxide Nanoparticles Using Acacia caesia Bark Extract and Its Photocatalytic and Antimicrobial Activities DOI: 10.3390/catal11121507
• 3418 cm⁻¹ tillid 1,0

  “The characteristic bands around 3418 are attributed to the presence of a small amount of water in the dried gel of YFeO 3.”

  Evolution of structure and improvement in dielectric properties of praseodymium substituted YFeO3 nanomaterials synthesized via a sol-gel auto-combustion method DOI: 10.1016/j.ceramint.2020.11.005
• 3400 cm⁻¹ tillid 1,0

  “The cm-1account bands around 3400 and 1630 for the presprominent The modes A 1g, B 1g, B and Eg are Raman active while A and 2g 2u ence of absorbed molecular water.”

  Azam 等 - 2012 - Effect of Mn doping on the structural and optical DOI: 10.1016/j.jallcom.2012.01.072
• 1417 cm⁻¹ tillid 1,0

  “The other bands at 1417 and 1414.21 corresponding to M-O-M bands The A cm-1 bond of H 2O molecule around 1627 is due to the presence of H-O-H vibration bending in water in M cm-1 belong to characteristic absorption peaks all samples before”

  Effect of rare earth and transition metal La-Mn substitution on electrical properties of co-precipitated M-type Ba-ferrites nanoparticles DOI: 10.1016/j.jre.2018.08.005
• 3399 cm⁻¹ tillid 1,0

  “From this spectrum, the absorption peak at 3399cm-1 was attributed to the vibration of the hydroxyl group because of the fact that the SnO retained certain adsorbed water 2 from the ambient atmosphere.”

  Aziz 等 - 2012 - Structure of SnO2 nanoparticles by sol-gel method DOI: 10.1016/j.matlet.2012.01.073
• 3345 cm⁻¹ tillid 1,0

  “- - 3430 3410 3393 3393 3374 3430 Alcohols / O-H strong & 3374 3374 3374 3374 3374 water stretching broad - - 3345 - - - - 3336 - - - - - 2961 2961 -”

  Azlah 等 - 2020 - A fast and reliable 2D-IR spectroscopic technique DOI: 10.1016/j.vibspec.2019.103014