What absorbs at 1138 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1138 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.

সম্ভাব্য কার্যকরী-গ্রুপ অ্যাসাইনমেন্ট

র্যাঙ্কিং জমা হওয়া সাহিত্য প্রমাণ প্রতিফলিত করে, একটি একক কর্তৃত্বপূর্ণ নিয়ম নয়। সর্বদা আপনার নমুনা প্রসঙ্গের বিরুদ্ধে নিশ্চিত করুন।

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 1138 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.

এই অ্যাসাইনমেন্টগুলোর পেছনে সাহিত্য

• Acetate আত্মবিশ্বাস 1.0

  “cm-1 strong band at 792 Bands at 1138 and 610 are assigned to C-O and 2 3 m Ti-O, respectively.”

  Errington 等 - 2010 - Synthesis and Structure of the Alkoxido-Titanium P DOI: 10.1007/s10876-010-0329-3
• Amide আত্মবিশ্বাস 1.0

  “*** II/COO(cid:3) Amide stretching 1188.83±0.08 1195.40±0.05 0.466±0.025 0.324±0.011 *** *** II/COO(cid:3) Amide stretching 1137.97±0.14 1141.26±0.12 0.649±0.012 0.275±0.010 II/COO(cid:3) Amide stretching 1065.34±0.23 1.084±0.012”

  Differentiation in MALDI-TOF MS and FTIR spectra between two pathovars of Xanthomonas oryzae DOI: 10.1016/j.saa.2014.06.056
• Acetate আত্মবিশ্বাস 1.0

  “The ratio A/B also increases for all the 1297 associated with chain vibrations, and the cm-1 cm-1 films, treated as there exist more non-hydrogen-bonded bands at 1138 and 832 assigned to the asymunmodified C-O-C carbonyls, in comparison to”

  Effect of PEG grafting density on surface properties of polyurethane substrata and the viability of osteoblast and fibroblast cells DOI: 10.1007/s10856-022-06668-1
• Phosphate (PO4) আত্মবিশ্বাস 1.0

  “12, the bands at 1138 and 1059 are P-O-C assigned to the stretching vibration of and PO 2/PO 3”

  Functional group effect on flame retardancy, thermal, and mechanical properties of organophosphorus-based magnesium oxysulfate whiskers as a flame retardant in polypropylene DOI: 10.1039/c7ra02863f
• আত্মবিশ্বাস 1.0

  “Moreover, the bands at 1009, 1122, and at 1138cm-1 region [21, 22], absorption peaks related to Er doping in were ascribed to stretching of Ti-O-C [17].”

  Gokdemir 等 - 2014 - Structural Modification of Sol-Gel Synthesized V2O DOI: 10.1155/2014/795384
• Hydroxyl (O-H) আত্মবিশ্বাস 1.0

  “cm-1), cm-1), biomarkers were (~980 Oligosaccharide C-OH stretching band (~1138 IntegrativeBiologyAcceptedManuscript cm-1), cm-1), Deoxyribose (~1188 Amide III (~1242 In-plane CH bending vibration from the”

  Jin 等 - 2017 - Fingerprinting microbiomes towards screening for m DOI: 10.1039/C7IB00009J.
• Thiol আত্মবিশ্বাস 1.0

  “in the intensity of this band correlates with one of 1138 Thus, it is obviously that this band is associated with n(SH) coordinated H 2S.”

  Martirosyan 等 - 2021 - Low Temperature Spectroscopic Study of the Sulfide DOI: 10.6060/mhc214035m
• আত্মবিশ্বাস 0.5

  “From table 1, incomplete assignment”

  Antioxidant and antidiabetic properties of biocompatible ceria oxide (CeO2) nanoparticles in mouse fibroblast NIH3T3 and insulin resistant HepG2 cells DOI: 10.1016/j.ceramint.2020.11.230