What absorbs at 814 cm⁻¹ in an FTIR spectrum?

Ātra atbilde

A band near 814 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 814 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

• Alkyl C-H pārliecība 1,0

  “Meanwhile, the peak of 1160.83 is the fingerprint for stretching the C-O ester At the same time, cm-1 the peak of 813.54 represents the alkane group's fingerprints.”

  Synthesis of magnetic nanocarbon using palm oil as the green precursor via microwave-assisted arc for wastewater treatment DOI: 10.1038/s41598-022-21982-y
• Carboxyl (COOH) pārliecība 1,0

  “9 depicts the two possible pathways of formic acid of the H 2BDC Raman ring breathing doublet bands at 814 and cm(cid:3)1”

  Embrechts 等 - 2020 - In situ Raman and FTIR spectroscopic study on the DOI: 10.1039/c9ra09968a
• Silicon (Si) pārliecība 1,0

  “cm(cid:4)1 fluorescence (SieO (OeSieO suggests that blueberry extract produces a phenombands at 999 stretching) and 814 enon in clay samples, thus limiting the detection of the spectra asymmetric stretching) due to changes in the Si environ”

  Nano-clays from natural and modified montmorillonite with and without added blueberry extract for active and intelligent food nanopackaging materials DOI: 10.1016/j.matchemphys.2017.03.052
• pārliecība 1,0

  “The peaks at 814 and 473 cm-1 are attributed to the amorphous Al-O stretching vibration cm-1 The peaks at 814 and 473 are attributed to the amorphous Al-O stretching vibration and Si-O-Si flexion, respectively [12].”

  Metakaolin-Based Geopolymer with Added TiO2 Particles: Physicomechanical Characteristics DOI: 10.3390/coatings7120233
• Acetate pārliecība 1,0

  “at 2927 and 1448 (CH2 group) meanwhile the tea tree at 3340 Biotersus spectra show these common bands 2920 (CH2 asymmetric bending), 1452 (CH2 bending), 2047, cm-1 1255 (C-O stretching vibration), 814 (CH), and 658 while YOCOCOIL shows band”

  In-Situ Comparative Study of Eucalyptus, Basil, Cloves, Thyme, Pine Tree, and Tea Tree Essential Oil Biocide Efficacy DOI: 10.3390/mps5030037
• Alkene (C=C) pārliecība 1,0

  “This process is also confirmed cm-1 cm-1 (d [bands at 814 and 936 =C-H), at 1650 by the lack of such a peak in the case of copolymers cm-1 (m (m C=C) and at 3105 =C-H)], aldehydes, especially”

  Synthesis and thermal properties of parent and modified DMN–co-GMA copolymers DOI: 10.1007/s10973-018-7162-6
• Silicon-oxygen (Si-O) pārliecība 1,0

  “Addicm-1 bands at 3400 and 1637 are due to the O-H group on the surface of nano-SiO 2, and tionally, the bands at 471 cm-1 and 814 cm-1 in nano-SiO2 spectrum represent Si-O bending”

  Preparation and Characterization of Novel Microgels Containing Nano-SiO2 and Copolymeric Hydrogel Based on Poly (Acrylamide) and Poly (Acrylic Acid): Morphological, Structural and Swelling Studies DOI: 10.3390/ma15144782
• Acetate pārliecība 1,0

  “The presence of sulfate in both samples is confirmed by the bands at 1249, 1035, and 814 cm-1, which correspond to the vibrations of asymmetric S = O stretching, symmetric C-O associated with a C-O-SO group, and C-O-S of the sulfate groups”

  Silver Nanoparticles Containing Fucoidan Synthesized by Green Method Have Anti-Trypanosoma cruzi Activity DOI: 10.3390/nano12122059