What absorbs at 962 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 962 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.

Possible functional-group assignments

Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.

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 962 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.

Literature behind these assignments

• Phosphate (PO4) confidence 1.0

  “The peaks at 962 and 928 2 cm-1 are the absorption peak of the phosphorus-containing derivatives, P-O-P and P-O, respectively.”

  Liang 等 - 2020 - Thermal Kinetics of a Lignin-Based Flame Retardant DOI: 10.3390/polym12092123
• N-O bond confidence 1.0

  “carterae, no peak was detected at 962.5 the total organic matter is equal to the total organic carbon (TOC) (for all fractions(Fig.”

  Rapid detection and quantification of haptophyte alkenones by Fourier transform infrared spectroscopy (FTIR) DOI: 10.1016/j.algal.2016.07.006
• Alkyl C-H confidence 1.0

  “Similar characteristic peaks could be observed for all of these four initiators and the expected cm-1 (C-H peaks of the ester group appeared at 2,962 cm-1 (C0O stretching), 1,730 stretching), and 1,243 and cm-1 (C-O 1,163 stretching).”

  Taenghom 等 - 2013 - Synthesis and characterization of nano-sized poly[ DOI: 10.1007/s00396-012-2867-8)
• Metal oxygen confidence 1.0

  “1050 Fe-O-Si/Si-O-Si Stretch 962 Si-O Stretch”

  do Nascimento-Dias 等 - 2020 - Detection of organic or inorganic material in Mart DOI: 10.1017/S147355042000021X
• C c single bond confidence 1.0

  “The peaks at around 997 978 β cm-1 and 962 regions indicate C-C stretching for the form”

  Chen 等 - 2015 - Processing and characterization of electrospun tra DOI: 10.1515/polyeng-2014-0124
• Carbohydrate confidence 1.0

  “More precisely, the peak at 962 cm-1 corresponded to the pyranose ring and the larger region at 1017 to 1045 cm-1, corresponds to the saccharide component ring strength.”

  Assessing the Biofilm Formation Capacity of the Wine Spoilage Yeast Brettanomyces bruxellensis through FTIR Spectroscopy DOI: 10.3390/microorganisms9030587
• confidence 1.0

  “A1a) is due to the vibration of apical Si-O bonds O vibrations resulting in two bands centred at and ∼962cm-1 (A1 symmetry), while the degenerate vibrations of basal Si- (Balan et al., 2021a).”

  Fritsch 等 - 2021 - Structural, textural, and chemical controls on the DOI: 10.5194/ejm-33-447-2021
• Carboxyl (COOH) confidence 1.0

  “FTIR 2 cm-1, at 2995.45 COO (asymmetric and symmetric stretching) due to uronic acid at of captopril (b) showed characteristic peaks at 962.48 cm-1 (CN group) cm-1, 1587.42 cm-1 cm-1 cm-1,”

  Ghumman 等 - 2022 - Synthesis of pH-Sensitive Cross-Linked Basil Seed DOI: 10.3390/gels8050291