What absorbs at 1020 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1020 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 1020 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

• confidence 1.0

  “In the fingerprint region, the wavenumbers 1020 and 1150 represent the asymmetric cm-1 cm-1 fingerprint region, the wavenumbers 1020 cm-1 and 1150 cm-1 represent the asymmetric stretching vibrations Si-O-Si.”

  Biosynthesized Silica Nanosuspension as Thermal Fluid in Parabolic Solar Panels DOI: 10.3390/e23020142
• Carbohydrate confidence 1.0

  “The discernible peaks at 1020 have been C\\O assigned to the stretching vibrations of the bond in the starch's glucose ring [21].”

  Gao 等 - 2021 - Synthetic mechanism of octenyl succinic anhydride DOI: 10.1016/j.ijbiomac.2021.01.082
• Water (H2O) confidence 1.0

  “At 14 days (Figure 4C), it is noteworthy that at depths of 2 and 3 mm, the level COO-), cm-1, presence of followed by another peak at 1020 which represents the presence of water absorption was lower (1636 cm-1), and the presence of the othe”

  Remineralization Potential of Three Restorative Glass Ionomer Cements: An In Vitro Study DOI: 10.3390/jcm12062434
• Aldehyde (CHO) confidence 1.0

  “On the other hand, peak 3 cm-1 at 1020 of the TCHO region represents non-structural CHO such as starch [15].”

  Gene-Transformation-Induced Changes in Chemical Functional Group Features and Molecular Structure Conformation in Alfalfa Plants Co-Expressing Lc-bHLH and C1-MYB Transcriptive Flavanoid Regulatory Genes: Effects of Single-Gene and Two-Gene Insertion DOI: 10.3390/ijms18030664
• confidence 1.0

  “the characteristic silica (Si-O) stretching vibrations of SMF appeared at 1020 Here, it is noteworthy that the bands present in cAB spectrum shifted to higher/lower wavenumbers in cSMFB”

  Silico-manganese fumes waste encapsulated cryogenic alginate beads for aqueous environment de-colorization DOI: 10.1016/j.jclepro.2019.118867
• Phosphate (PO4) confidence 1.0

  “O-P-O (1080-1095 to investigate DNA and phospholipid damage following ionization vibration (1020 and symmetric at the single cell level.”

  A new approach to studying the effects of ionising radiation on single cells using FTIR synchrotron microspectroscopy DOI: 10.1016/j.radphyschem.2013.03.037
• C c single bond confidence 1.0

  “The variable peak at 1020cm-1 110cm-1 is due to C-C-C in plane bending vibraThe peak at is due to the CH out of plane bending.”

  Nagabalalsubramanian 等 - 2009 - A scaled quantum mechanical approach of vibrationa DOI: 10.1016/j.saa.2009.10.002
• Acetate confidence 1.0

  “cm-1, in Figure 4A shows bands at 1110, 1020, 944, and 905 case, however, no electron scavenger was added to the solution 1110-cm-1 of which the 1020and bands can be assigned to g Fe3+ because ions were unstable in pH 3, causing an C-O (Ti-”

  Nakamura 和 Nakato - 2004 - Primary intermediates of oxygen photoevolution rea DOI: 10.1021/ja0388764CCC