Apakah yang menyerap pada 981 cm⁻¹ dalam spektrum FTIR?

Jawapan pantas

Jalur berhampiran 981 cm⁻¹ biasanya ditafsirkan dengan memeriksa kumpulan berfungsi yang sering wujud bersama di sana dalam literatur, kemudian mengesahkan sekurang-kurangnya satu atau dua puncak tambahan dalam sampel yang sama. Halaman ini menyusun tugasan tersebut berdasarkan bukti terkumpul dan bukannya peraturan buku teks tetap tunggal.

Penetapan kumpulan berfungsi yang mungkin

Peringkat mencerminkan bukti literatur terkumpul, bukan peraturan tetap tunggal. Sentiasa sahkan berdasarkan konteks sampel anda.

Bahan yang mungkin

Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.

Logik spektrum

Jalur ini menjadi bermakna hanya apabila dibaca dengan puncak-puncak jirannya. Dalam amalan, penganalisis terlebih dahulu melihat tugasan di atas, kemudian menyemak sama ada sampel yang sama juga menunjukkan puncak lain yang dijangka untuk motif struktur yang sama. Jalur tunggal berhampiran 981 cm⁻¹ biasanya tidak mencukupi untuk pengenalpastian bahan dengan sendirinya.

Penggunaan dunia sebenar

Jenis pertanyaan ini biasa dalam pengenalpastian polimer, saringan plastik tidak diketahui, penyelesaian masalah QC, pengesahan bahan kitar semula, dan semakan tugasan puncak yang disokong oleh literatur.

Kesilapan biasa

• Menganggap satu jalur terpencil sebagai bukti bahan tanpa memeriksa sekurang-kurangnya satu atau dua puncak sokongan.
• Mengabaikan pertindihan: pelbagai kumpulan berfungsi boleh menyumbang berhampiran nombor gelombang yang sama.
• Melangkau pengesahan apabila bahan tambahan, campuran, pengoksidaan, atau pencemaran boleh memesongkan spektrum.

Nasihat pengesahan

Apabila kekaburan masih ada, sahkan hipotesis dengan DSC, GC-MS, atau TGA, terutamanya untuk campuran, sampel terdegradasi, dan polimer terisi.

Literatur di sebalik penetapan ini

• Alkyl C-H keyakinan 1.0

  “the vibration identified as ν(C-H) is found in SERS spectrum in a less intense band at 981 Despite the similarity of SERS signal acquired for neutral and deprotonated state of artepillin C,”

  EXPRESS: Vibrational Spectroscopic Characterization and Coherent Anti-Stokes Raman Spectroscopy (CARS) Imaging of Artepillin C DOI: 10.1177/0003702820904456
• Silanol (Si-OH) keyakinan 1.0

  “line This observation is accompanied with the reduction of network SiO band at 802 2 cm-1 Meanwhile, the Si-OH peak at 981 showed the increased of intensity in silica synthesized using 1% and 2% of gelatin concentration.”

  The effect of gelatin as pore expander in green synthesis mesoporous silica for methylene blue adsorption DOI: 10.1038/s41598-022-19615-5
• C-O single bond keyakinan 1.0

  “Finally, two bands may be found at 981 and 1051 potentially related to C-O 1 and to the stretching of C-OH bonds from hydroxyl moieties [51].”

  Basso Peressut 等 - 2021 - Development of self-assembling sulfonated graphene DOI: 10.1016/j.matchemphys.2020.122945.
• Silicon (Si) keyakinan 1.0

  “Two strong peaks are noticed: one of them centered at 981 cm-1, attributed to symmetric stretching vibration of Si(Al)-O-Si bonds, and another one at 527”

  Use of Slag/Sugar Cane Bagasse Ash (SCBA) Blends in the Production of Alkali-Activated Materials DOI: 10.3390/ma6083108
• Amide keyakinan 1.0

  “The absorbance peak located at around 981 and 996 can be assigned is the C-N stretching vibrations cm-1 peak located at around 981 and 996 cm-1 can be assigned is the C-N stretching vibrations of amine.”

  Green Synthesis, Characterization, Enzyme Inhibition, Antimicrobial Potential, and Cytotoxic Activity of Plant Mediated Silver Nanoparticle Using Ricinus communis Leaf and Root Extracts DOI: 10.3390/biom11020206
• Ring structure keyakinan 1.0

  “In the curve of the EHO, cm-1 peaks at 981 characteristic of the anti-symmetric deformation vibration absorption peaks at 981 cm-1 characteristic of the anti-symmetric deformation vibration absorption cm-1 four-membered peak of the ring in”

  Preparation of Bis[(3-ethyl-3-methoxyoxetane)propyl]diphenylsilane and Investigation of Its Cationic UV-Curing Material Properties DOI: 10.3390/polym13152573
• Aromatic ring keyakinan 1.0

  “Moreover, in the Raman spectrum (Figure 4b), the vibrations from symmetric benzene/pyrrole in-phase and out-of-phase breathing modes of tryptophan and phenylalanine (904 cm-1, 981 cm-1) are observed.”

  FTIR and Raman Spectroscopy-Based Biochemical Profiling Reflects Genomic Diversity of Clinical Candida Isolates That May Be Useful for Diagnosis and Targeted Therapy of Candidiasis DOI: 10.3390/ijms20040988
• Ring structure keyakinan 1.0

  “In the GO spectrum, the peak at 1049 cm-1 corresponds to the alkoxy group [15,28] and the one at 981 cm-1 is assigned to the ring out-of-plane deformation [29].”

  Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330