What absorbs at 764 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 764 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.

Possibili assegnazioni di gruppi funzionali

La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.

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 764 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.

Letteratura dietro queste assegnazioni

• C-O single bond affidabilità 1,0

  “Meanwhile, the sharp bands at 764.31 and cm-1 761.73 are indicative of glycosidic linkage [56].”

  Characterization of Polyhydroxybutyrate, PHB, Synthesized by Newly Isolated Haloarchaea Halolamina spp. DOI: 10.3390/molecules27217366
• Alkyl C-H affidabilità 1,0

  “The -CF 2 CF2 wagging (489 cm-1) and bending (610 cm-1), the skeletal bending (764 cm-1), and the -CH2 cm-1) cm-1), cm-1), wagging (489 and bending (610 the skeletal bending (764 and the -CH rocking 2 rocking (795 cm-1) and twisting (975 cm”

  Terraza 等 - 2018 - Preparation of CuONPs@PVDFNon-Woven Polyester Com DOI: 10.3390/polym10080862
• Metalloid oxygen affidabilità 1,0

  “LLM confirmed rule peak-group candidate”

  Spectroscopic properties in Er3+-doped germanotellurite glasses and glass ceramics for mid-infrared laser materials DOI: 10.1038/srep43186
• affidabilità 1,0

  “The peak at 764 can be assigned to the stretching vibration of Zr-O cm-1 bond.”

  Thin Film Mixed Matrix Hollow Fiber Membrane Fabricated by Incorporation of Amine Functionalized Metal-Organic Framework for CO2/N2 Separation DOI: 10.3390/ma14123366
• Nitrate affidabilità 1,0

  “cm-1 region of the IR spectrum (~805 so all of the peaks in the 720-850 range were deconvoluted (Figure S1) to determine the contribution, if any, by nitrate absorption cm-1 under the 764 and 840 peaks.”

  Catalysis of the Thermal Decomposition of Transition Metal Nitrate Hydrates by Poly(vinylidene difluoride) DOI: 10.3390/polym13183112
• Alkyl C-H affidabilità 1,0

  “Adsorption bands that occurred at approximately 968, 815, and 764 cm-1 were related to C-H broadened and reduced after adsorption of zinc(II) (Figure 11b) [43].”

  Rapid Removal of Zinc(II) from Aqueous Solutions Using a Mesoporous Activated Carbon Prepared from Agricultural Waste DOI: 10.3390/ma10091002
• affidabilità 0,8

  “Explicit assignment as a-phase peak of non-polar.”

  Sultana 等 - 2021 - Enhanced ionic transport in ferroelectric polymer DOI: 10.1039/d1ta04367f