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

Бърз отговор

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.

Възможни определяния на функционални групи

Класирането отразява натрупаните литературни доказателства, а не единично авторитетно правило. Винаги потвърждавайте спрямо контекста на вашата проба.

Възможни материали

Материалите се показват само когато същата литературна база поддържа тази лента и поне един допълнителен характерен пик.

Логика на спектъра

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.

Използване в реални условия

Този тип заявка е често срещана при идентификация на полимери, скрининг на неизвестни пластмаси, отстраняване на проблеми с качеството, проверка на рециклирани материали и преглед на приписване на пикове, подкрепено с литература.

Често срещани грешки

• Разглеждане на една изолирана лента като доказателство за материал, без да се проверяват поне един или два подкрепящи пика.
• Пренебрегване на припокриване: множество функционални групи могат да допринасят близо до едно и също вълново число.
• Пропускане на валидиране, когато добавки, смеси, окисление или замърсяване могат да изкривят спектъра.

Съвет за проверка

Когато остава неяснота, потвърдете хипотезата с DSC, GC-MS или TGA, особено за смеси, деградирани проби и пълнени полимери.

Литература зад тези определяния

• Alkyl C-H достоверност 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) достоверност 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) достоверност 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
• достоверност 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 достоверност 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) достоверност 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) достоверност 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 достоверност 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