What absorbs at 445 cm⁻¹ in an FTIR spectrum?

Ātra atbilde

A band near 445 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 445 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

• Carbonyl (C=O) pārliecība 1,0

  “443 The FTIR results for the black paint confirmed the presence of the characteristic absorption 444 peaks of an alkyd paint, dominated by the sharp and intense absorptions at 1720 and 1256 445 cm-1, due to the stretching mode of the carbon”

  Catto 等 - 2021 - Bioremoval of graffiti using novel commercial stra DOI: 10.1111/j.1574-6941.2006.00028.x
• Phosphate (PO4) pārliecība 1,0

  “Therefore, in the obtained Raman spectra the presence of the phosphate group is highlighted by the vibrational bands at around 445 and 432 cm-1 that could be attributed 𝜈 to (PO43-) bending mode.”

  Development of Silver Doped Hydroxyapatite Thin Films for Biomedical Applications DOI: 10.3390/coatings12030341
• pārliecība 1,0

  “445 asymmetric stretching vibration of the Si-O-T group between 991 and 977 446 Furthermore, when these bands are compared to the same band in the infrared spectra 447 of the precursors, MK and SSA, there is a shift of this band to a lower”

  Istuque 等 - 2019 - Effect of sewage sludge ash on mechanical and micr DOI: 10.1016/j.conbuildmat.2019.01.093
• pārliecība 1,0

  “The IR spectrum of pure ZnO particles cm-1 (Figure 5a) showed two characteristic peaks: a broad and very weak peak at 3431 (Figure 5a) showed two characteristic peaks: a broad and very weak peak at 3431 cm-1 correcorresponding to the O-H st”

  Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process DOI: 10.3390/coatings11020183
• Ester pārliecība 1,0

  “a group of bands at 1238, 1163, 1114 and 1099 obtained from the 445 cm-1 ester groups stretching vibrations (-C-O);”

  Kharbach 等 - 2021 - New insights into the Argan oil categories charact DOI: 10.1016/j.talanta.2020.122073
• Metal oxygen pārliecība 1,0

  “The two strong bands at 445 and 610 are attributed to the O-Ti-O bending vibration and asymmetric Ti-O stretching vibration, respectively.”

  In Situ High-Pressure Raman Spectroscopic, Single-Crystal X-ray Diffraction, and FTIR Investigations of Rutile and TiO2II DOI: 10.3390/min13050703
• Silicon (Si) pārliecība 1,0

  “cm-1 cm-1 υ2-type Two peaks at about 445 and 483 associated with internal deformaTwo peaks at about 445 cm-1 and 483 cm-1 associated with υ2-type internal υ4-type tions (O non-Si-O vibrations) and asymmetric bending (ASB) vibrations deforma”

  Madadi 和 Wei - 2022 - Characterization of Calcium Silicate Hydrate Gels DOI: 10.3390/gels8020075
• pārliecība 1,0

  “These DTG curves also presented peaks 445 related to the formation of hydrated calcium silicates and calcium aluminates.”

  Moraes 等 - 2019 - Production of bamboo leaf ash by auto-combustion f DOI: 10.1016/j.conbuildmat.2019.03.007