What absorbs at 1438 cm⁻¹ in an FTIR spectrum?

快速回答

A band near 1438 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 1438 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 absorption peak at 1438 is from symmetric bending deformation C-H of 45 46 -COOCH group while the C-H stretching absorption peaks of -CH and CH appear at 2895 and 2966”

  Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754
• Alkene (C=C) 信心 1.0

  “In addition, the bands at 3007 based cm(cid:0) cm(cid:0) Calibration (C-- 1 1 (=C-H asymmetric stretching), 1654 C stretching) 1438 cm(cid:0) (C-- 1 =C-H H scissoring deformation), 1258 (cis deformation), and”

  Comparison and chemical structure-related basis of species discrimination of animal fats by Raman spectroscopy using near-infrared and visible excitation lasers DOI: 10.1016/j.lwt.2020.110105
• Acetate 信心 1.0

  “The peak at around 1438 is assigned to a symmetric vibration of the C-O bond, which means that tartaric acid reacts with cm-1 PbTiO during the preparation process.”

  Hemeda 等 - 2021 - Synthesis of nanometer-sized PbZrxTi1-xO3 for gamm DOI: 10.1016/j.jpcs.2020.109688
• Amide 信心 1.0

  “The main peaks cm-1 cm-1 for chitosan can be assigned as follows: 3439 (N-H and O-H stretching vibration), 2925 cm-1 cm-1 (CH symmetric stretch), 1666 (C=O stretching vibration), 1438 (C-N stretching vibration), 3”

  Synthesis, Characterization, and Antibacterial Activity of Cross-Linked Chitosan-Glutaraldehyde DOI: 10.3390/md11051534
• 信心 1.0

  “The characteristic cm-1 to reported single fcc Pt phase [38, 41], while peaks at peaks at 1438, 1118 and 613 can be assigned to in43.7o, 50.7o 74.5o and correspond to reported single fcc Cu plane OH bending of carboxylic acids, C-O stretch”

  Green synthesis of bimetallic Pt@Cu nanostructures for catalytic oxidative desulfurization of model oil DOI: 10.1007/s40097-017-0223-8
• Acetate 信心 1.0

  “3SO system at 847, 988, 1256, PMMA in PVC-PMMA-LiCF band due to C O is shifted to These shifts are 3 1438cm-1 are shifted to 777, 973, 1286, 1393 and 1387 and Li+ ion and the expected to be due to interaction between 1484cm-1, respectively.”

  Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012
• Hydroxyl (O-H) 信心 1.0

  “cm-1, Other features of the fraction are the absorption bands at 1438 and 1444 which are related to the first overtone of the -OH stretch of H 2O.”

  Synergistic Effects of n-Hexane Fraction of Parkia biglobosa (Jacq.) Bark Extract and Selected Antibiotics on Bacterial Isolates DOI: 10.3390/su9020228
• Alkyl C-H 信心 1.0

  “• COO- • The COOstretch, C-H rock, and C-O-C stretch in the unplasticized sample (SC0) may The stretch, C-H rock, and C-O-C stretch in the unplasticized sample (SC0) may cm-1, cm-1, cm-1, be found around 1665 cm-1, 1438 cm-1, and 1014 cm-1,”

  Adam 等 - 2023 - Insight into the Effect of Glycerol on Dielectric DOI: 10.3390/molecules28083461