What absorbs at 651 cm⁻¹ in an FTIR spectrum?

Ātra atbilde

A band near 651 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

Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.

Iespējamie materiāli

Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.

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 651 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

• Carbon bromine pārliecība 1,0

  “3 amines), 1025 (C-O stretch of phenols), 818 (NH bond of amines), 761 (C-H bonded aromatic 2 4 5 cm-1 ortho disubstituted benzenes), 651 (C-Br stretch of alkyl halides).”

  Yugandhar 等 - 2019 - Biofabrication, characterization and evaluation of DOI: 10.1088/2053-1591/ab0db9
• Carbon bromine pārliecība 1,0

  “The FTIR pattern of ZnAl 2O 4: Mn/GO-Br displays a peak at 651 representing C-Br, which reveals the existence of a connection between GO and the active group, -Br.”

  Synthesis of Green and Red-Emitting Polymethyl Methacrylate Composites Grafted from ZnAl2O4:Mn-Bonded GO via Surface-Initiated Atom Transfer Radical Polymerization DOI: 10.3390/polym14173689
• Nitrate pārliecība 1,0

  “whereas the band at 651 is associated to Co-O vibrations in the tetrahedral site of the lattice, indicating the formation of Co(NO 3) 2.6H 2O (98 wt.% Synth).”

  Lima-Tenorio 等 - 2018 - Pseudocapacitance Properties of Co3O4 Nanoparticle DOI: 10.1590/1980-5373-MR-2017-0521
• Silicon-oxygen (Si-O) pārliecība 1,0

  “The peak, centered 434 (νO-Si-O) identified by some peaks, centered at 520, 651 cm-1 at 1018 cm-1 slightly decreased.”

  Radev 等 - 2009 - OrganicInorganic bioactive materials Part II in DOI: 10.2478/s11532-009-0076-1
• Amide pārliecība 1,0

  “The new absorption peak at 651 appears due to the attachment of the amide group and the stretching mode of ZnO [18,19].”

  Toteva 等 - 2021 - Pollutants Sorbent Made of Cotton Fabric Modified DOI: 10.3390/ma14123242
• Silicon-oxygen (Si-O) pārliecība 1,0

  “It could be seen in the FTIR spectra that a weak peak appeared at 651 cm-1 was due to the bond vibration mode of the α-quartz.”

  Zaid 等 - 2017 - Effect of Sintering on Crystallization and Structu DOI: 10.2298/SOS1704409Z
• pārliecība 0,9

  “Explicit assignment: peaks at 651 and 671 confirm C-Br”

  Kocuria marina BS-15 a biosurfactant producing halophilic bacteria isolated from solar salt works in India DOI: 10.1016/j.sjbs.2014.01.001