What absorbs at 739 cm⁻¹ in an FTIR spectrum?

Raskt svar

A band near 739 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.

Mulige funksjonelle gruppe-tilordninger

Rangeringen gjenspeiler akkumulert litteraturbevis, ikke en enkelt autoritativ regel. Bekreft alltid mot prøvekonteksten din.

Mulige materialer

Materialer vises kun når samme litteraturbase støtter dette båndet og minst en annen karakteristisk topp.

Spektrum-logikk

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

Virkelig bruk

Denne typen forespørsel er vanlig i polymeridentifikasjon, screening av ukjent plast, feilsøking i kvalitetskontroll, verifisering av resirkulert materiale og litteraturstøttet gjennomgang av topptilordning.

Vanlige feil

• Behandle ett isolert bånd som bevis på et materiale uten å sjekke minst en eller to støttende topper.
• Ignorerer overlapping: flere funksjonelle grupper kan bidra nær samme bølgetall.
• Hopp over validering når tilsetningsstoffer, blandinger, oksidasjon eller forurensning kan forvrenge spekteret.

Verifiseringsråd

Når tvetydighet gjenstår, valider hypotesen med DSC, GC-MS eller TGA, spesielt for blandinger, nedbrutte prøver og fylte polymerer.

Litteratur bak disse tilordningene

• Alkyl C-H konfidens 1.0

  “Meanwhile, numerous strong bands 739 804 cm-1, cm-1, cm-1 863 898 and 1455 in DiaRoot suggested the stretching of C-H groups.”

  Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517
• C c single bond konfidens 1.0

  “Meanwhile, the peak at assigned 781, 767, 772, 735, 739 cm-1 corresponded to the C-C stretching vibration of the benzene ring [19].”

  Modification of Hydroxypropyltrimethyl Ammonium Chitosan with Organic Acid: Synthesis, Characterization, and Antioxidant Activity DOI: 10.3390/polym12112460
• Alkyl C-H konfidens 1.0

  “As a result of this experiment, we has peaks at 739 769 and cm-1 differently observed colored areas in the reaction tube with 815 assigned to out-of-plane CH bending vibrations orange products accumulated in the region of higher tempertypic”

  Talyzin 等 - 2014 - Hydrogen-Driven Cage Unzipping of C-60 into Nano-G DOI: 10.1021/jp500377s
• Aromatic ring konfidens 1.0

  “Besides, the peaks at 1560 and 739 corresponded to stretching vibration of aromatic C=C to the successful modification that the molecular chain of HNH was grafted onto the surface of rGO.”

  One-Step Reduction and Surface Modification of Graphene Oxide by 3-Hydroxy-2-Naphthoic Acid Hydrazide and Its Polypropylene Nanocomposites DOI: 10.3390/nano7020025
• konfidens 0.8

  “Same as above.”

  Purification and Glutaraldehyde Activation Study on HCl-Doped PVA–PANI Copolymers with Different Aniline Concentrations DOI: 10.3390/molecules24010063