What absorbs at 981 cm⁻¹ in an FTIR spectrum?

快速回答

A band near 981 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.

可能的官能基指派

排名反映累積的文獻證據，而非單一權威規則。請務必根據您的樣品背景進行確認。

可能的材料

僅當同一文獻庫支援此波段以及至少一個額外特徵峰時，才會顯示材料。

光譜邏輯

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 981 cm⁻¹ is usually not enough for material identification by itself.

實際使用

此類查詢常見於聚合物鑑別、未知塑膠篩選、品管故障排除、再生材料驗證，以及基於文獻的峰值歸屬審查。

常見錯誤

• 將一個孤立的譜帶視為材料的證據，而未檢查至少一兩個支持峰。
• 忽略重疊：多個官能團可能在相同波數附近貢獻。
• 當添加劑、混合物、氧化或污染物可能扭曲譜圖時，跳過驗證。

驗證建議

當仍然存在歧義時，使用DSC、GC-MS或TGA驗證假設，特別是對於混合物、降解樣品和填充聚合物。

這些指派背後的文獻

• Alkyl C-H 信心 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) 信心 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 信心 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) 信心 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 信心 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 信心 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 信心 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 信心 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