What absorbs at 1290 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1290 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.

Mogelijke functionele-groeptoewijzingen

Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.

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 1290 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.

Literatuur achter deze toewijzingen

• Alkyl C-H vertrouwen 1,0

  “-0(cid:5)6 movement of the anions was near at V, the two peaks cm-1 cm-1 The peaks at 1290 and 1025 were assigned were not symmetrical well due to the influence of backto in-plane C-H deformation and in-plane C-H stretchkinetics.27 From gro”

  Structural and Electronic Property Study of Polypyrrole Nanowires Synthesized by Electrochemical Method DOI: 10.1166/nnl.2013.1514
• Aromatic ring vertrouwen 1,0

  “1543 C C stretching in quinoid rings C stretching in quinoid rings 1290 C N stretching 1538 C 1447 C C stretching in benzoid rings 2996”

  Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738
• Nitrate vertrouwen 1,0

  “The peak at 1290 of NH The absence of any peaks for water is a distinguishing feature 3 indicative of monodentate nitrate species, disappears above 473 in this case that supports our mass spectroscopy data (not shown) cm-1,”

  Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122
• Ester vertrouwen 1,0

  “The degradation of the PS:PLA composites is reflected by a considerable decrease in the intensity of cm21) and -CH the ester group absorption band (1290 cm21) with simultaneous appearabsorption band (3000”

  Shimpi 等 - 2014 - Preparation, Characterization, and Biodegradation DOI: 10.1002/pc.22658
• Hydroxyl (O-H) vertrouwen 1,0

  “The PtNPs/GNs/PG electrode showed bands at 988 cm-1, 1290 cm-1, 1632 cm-1 and 3222 cm-1, which confirms O-H bonding, C-N stretching and N-H, as well as CThebareelectrodestudiedbySEMshowsnodeposition(Figure6A)ontoPGE,whereas cm-1, which was”

  An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386
• Amide vertrouwen 1,0

  “C-N The vibrations at 1462 and 1290 cm-1 are generated because of stretching and C-Cl bond is responsible for the bands at 605 and 633 cm-1 bending vibrations, while the (M-O) Er2O3 has a metal-oxygen bond shown at 557 cm-1 [29].”

  New Hybrid PVC/PVP Polymer Blend Modified with Er2O3 Nanoparticles for Optoelectronic Applications DOI: 10.3390/polym15030684
• Amide vertrouwen 1,0

  “cm-1 [ν(N-H)], to the stretching vibration the band at 1637 cm-1 CO [ν(CO)], stretching vibration the band at 1569 to the quinonoid ring-stretching vibration, the bands at 1505 cm-1 to the benzenoid ring-stretching vibrations, the and 149”

  Blaha 等 - 2019 - Role of p-Benzoquinone in the Synthesis of a Condu DOI: 10.1021/acsomega.9b00542
• Hydroxyl (O-H) vertrouwen 1,0

  “cm(cid:1)1 cm(cid:1)1 cm(cid:1)1 The peak from 1290 of 3000 to 3500 to 1120 is due to the presence is indicative of hydroxyl group present -C-O -C Ciprofloxacin of symmetric and antisymmetric stretching of = O.”

  Poly Lactic-Co-Glycolic Acid Nano-Carriers for Encapsulation and Controlled Release of Hydrophobic Drug to Enhance the Bioavailability and Antimicrobial Properties DOI: 10.1177/15593258231152117