What absorbs at 1263 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1263 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.

可能的官能团归属

排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。

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 1263 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.

这些分配背后的文献

• Alkyl C-H 置信度 1.0

  “The spectrum shows also two bands at 1263cm(cid:2)1, C-H C-O 1369 and owing to bending of cellulose and the stretching vibration 1040cm(cid:2)1”

  Alkali and epoxy-silane surface modified pine cone flour reinforced polypropylene/poly (lactic acid) DOI: 10.1080/01694243.2021.1952677
• C c single bond 置信度 1.0

  “The starch spectrum exhibited three characteristic scattering peaks at 1263, and941cm-1, 1053, whichareduetothestretchingofC-O,C-C,andC-OHbondsbelonging cm-1 to starch [37].”

  Preparation and Characterization of Super-Absorbing Gel Formulated from -Carrageenan–Potato Peel Starch Blended Polymers DOI: 10.3390/polym13244308
• Silicon carbon 置信度 1.0

  “LLM confirmed rule peak-group candidate”

  A forensic international market survey of condom lubricants and personal hygiene products using ATR-FTIR coupled to chemometrics DOI: 10.1016/j.scijus.2021.01.005
• Alkene (C=C) 置信度 1.0

  “The characteristic bands at 1508 cm-1 and 1263 cm-1 were determined to be C=C, C-O stretching or bending vibrations of the groups in lignin.”

  Cresnar 等 - 2021 - Insight into the Surface Properties of Wood Fiber- DOI: 10.3390/polym13101535
• Acetate 置信度 1.0

  “C=O stretching 1724 O-H Overlapping (def.) of C=C ring stretching 1585, 1442 C-O stretching due to phenol 1263 C-H C=C-H (def.) of (o.o.p.) from aromatic rings 800 Weak absorption indicating C-S stretching 730, 710, 678 reported melanins ar”

  Purification and characterisation of a sulphur rich melanin from edible mushroom Termitomyces albuminosus Heim DOI: 10.1080/21501203.2018.1494060
• Acetate 置信度 1.0

  “Additional lignin-related peaks are those at 1603 cm-1 for aromatic skeletal and C=O stretch vibrations, 1506 cm-1 for the C=C stretch of aromatic skeletal vibration and 1263 cm-1 for the G-ring plus C=O stretch [23].”

  Jambrekovic 等 - 2022 - Viscoelastic and Thermal Properties of Styrene Mod DOI: 10.3390/polym14040786
• Acetate 置信度 1.0

  “The peaks at 1263 cm-1 is the characteristic peak of CO-O-C, and the characteristic peak of C-O-C is at 1091 cm-1.”

  Surface Modification of Carbon Microspheres with Guanidine Phosphate and Its Application as a Flame Retardant in PET DOI: 10.3390/polym12081689
• Acetate 置信度 1.0

  “Nanoscale Research Letters Page 6 of 10 (2016) 11:152 cm-1 C-O are attributed to the stretching of 1263”

  Kolodynska 等 - 2016 - Development of New Effective Sorbents Based on Nan DOI: 10.1186/s11671-016-1371-3