What absorbs at 1228 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1228 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 1228 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.

これらのアサインの根拠となる文献

• Acetate 信頼度 1.0

  “present in the peaks at 1034 (carbon-oxy- (32.6)A (0.9)A 2.5 159.6 4.9 cm-1 gen (C-O) stretching), at 1228 (carbon-hydrogen”

  Acetylation of tropical hardwood species from forest plantations in Costa Rica: an FTIR spectroscopic analysis DOI: 10.1186/s10086-020-01898-9
• Aromatic ring 信頼度 1.0

  “The peaks at cm-1 cm-1 1228 and 1072 were attributed to aromatic ether C-O or C-O-C stretching.”

  Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants DOI: 10.1038/s41598-022-06600-1
• Sulfate (SO4) 信頼度 1.0

  “LLM confirmed rule peak-group candidate”

  In vivo prebiotic properties of Ascophyllum nodosum polysaccharide hydrolysates from lactic acid fermentation DOI: 10.1007/s10811-019-01794-w
• Phosphate (PO4) 信頼度 1.0

  “2 9 cm-1 and proteins, a peak at 1228 due to P=O stretching of phosphate-carrying compounds cm-1 and at 1053 due to bands of carbohydrates within the microbial cell walls [14,16].”

  Quantification of live Lactobacillus acidophilus in mixed populations of live and killed by application of Attenuated Reflection Fourier Transform Infrared Spectroscopy combined with Chemometrics DOI: 10.1016/j.jpba.2018.03.009
• Amide 信頼度 1.0

  “LLM confirmed rule peak-group candidate”

  A comparative study on silicon nitride, titanium and polyether ether ketone on mouse pre-osteoblast cells DOI: 10.1002/mds3.10139.
• 信頼度 1.0

  “The GO:CA (0:1) sample spectrum, shown in Figure 5b, presentsbandsat439cm-1 1228cm-1 improved reduction of GO.”

  Joining Caffeic Acid and Hydrothermal Treatment to Produce Environmentally Benign Highly Reduced Graphene Oxide DOI: 10.3390/nano11030732
• Hydroxyl (O-H) 信頼度 1.0

  “Projections after winter exposure were also characterized by signals from aromatic skeletal, i.e., signals cm-1 cm-1and at 1516 and 1440 from C = C stretching of aromatic rings and from phenols, at 1359 1228 cm-1 from O-H deformation and C-”

  Photodegradation of typical Mediterranean plant litters: variations with Quercus species and the leaf-surface exposed DOI: 10.1007/s10342-022
• Acetate 信頼度 1.0

  “The bands at 1228 and 1179/cm were assigned to the chain conformation and the stretching vibration of C-O-C, respectively.”

  Biodegradation of P(3HB-co-4HB) powder by Pseudomonas mendocina for preparation low-molecular-mass P(3HB-co-4HB) DOI: 10.1007/s13205-017-0824-4