What absorbs at 1285 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1285 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

Spectrum logic

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 1285 cm⁻¹ is usually not enough for material identification by itself.

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

이 할당의 배경이 되는 문헌

• N c o 신뢰도 1.0

  “The peaks at 1285 and 1078 are due to Ar-O = prepared with NCO/OH 2 are shown in Figure 3A and B, and R-O stretching, respectively, showing the presence of 1700 1720”

  Shoaib 和 Bahadur - 2016 - Synthesis of thermally and mechanically improved p DOI: 10.1515/epoly-2016-0134
• Acetate 신뢰도 1.0

  “An intense peak at 2 cm-1 C=O 1710 is due to the stretching vibration and the cm-1 C-O signal at 1285 is attributable to the stretch.”

  β-cyclodextrin coating: improving biocompatibility of magnetic nanocomposites for biomedical applications DOI: 10.1007/s10856-020-6361-4
• Silicon (Si) 신뢰도 1.0

  “3379cm-1 3381cm-1 mightbeduetoCa-Ostretchingvibrations,whiletheintense and are ascribed to Al-OH and AlSi1123cm-1 bands at 953 and OH/Li-vibrations, respectively [36], since Al3+ and Fe3+ attributed to Si-O strong 1389cm-1 replace the Si4+”

  Ahmad 等 - 2021 - Spectroscopic Analysis for Harnessing the Quality DOI: 10.1155/2021/6629640
• Amide 신뢰도 1.0

  “PVP displayed a carbonyl stretching band at 1655 a band at 1655 cm-1, a group of C-H deformation-related bands around 1450 cm-1, CH2 cm-1, group of C-H deformation-related bands around 1450 CH wagging coupled with C2 wagging coupled with C-”

  Polypyrrole Aerogels: Efficient Adsorbents of Cr(VI) Ions from Aqueous Solutions DOI: 10.3390/gels9070582
• Acetate 신뢰도 1.0

  “correspond to the C-C bond are centered at 1350 and 1325 cm-1 for the gauche and trans conformation, cm-1 gauche trans the C-C bond are centered at 1350 and 1325 for the and conformation, while the while the absorption bands that correspond”

  Bollas 等 - 2017 - Polymer Conformation under Confinement DOI: 10.3390/polym9020073
• Amide 신뢰도 1.0

  “peaks at 1285 1207 1115 and cm-1 1075 were attributed to C-N and C-O-C stretching vibrations, C-O stretching vibration cm-1”

  In Vitro Interaction of Doxorubicin-Loaded Silk Sericin Nanocarriers with MCF-7 Breast Cancer Cells Leads to DNA Damage DOI: 10.3390/polym13132047
• Alkyl C-H 신뢰도 1.0

  “The oleic acid showed principal peaks at 2922 cm-1, 2853 1708 1412 1285 and 935 that indicated asymmetric CH stretching, 2 cm-1, 1708 cm-1, 1412 cm-1, 1285 cm-1 and 935 cm-1 that indicated asymmetric CH2 stretchsymmetric CH stretching, C=O”

  In Vitro and Ex Vivo Evaluation of Fluocinolone Acetonide–Acitretin-Coloaded Nanostructured Lipid Carriers for Topical Treatment of Psoriasis DOI: 10.3390/gels8110746
• Hydroxyl (O-H) 신뢰도 1.0

  “The spectra of catechin displayed cm-1 cm-1, cm-1, peaks at 3482 representing O-H stretching regions, and 1656 1285 cm-1 cm-1 1150 and 1071 representing the existence of aromatic rings [25].”

  Shah 等 - 2022 - Encapsulation of Catechin into beta-Glucan Matrix DOI: 10.3390/foods11101493