What absorbs at 938 cm⁻¹ in an FTIR spectrum?
A band near 938 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Jawapan pantas
A band near 938 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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| Silicon (Si) | 7 | 7 | 1.0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1.0 |
| Metal oxygen | 4 | 4 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Bahan yang mungkin
| Bahan | Puncak sokongan | Kumpulan bertindih | Sumber dipetik |
|---|---|---|---|
| SnO2 | 938, 2800, 1547 | Metal oxygen | 1 |
Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.
Logik spektrum
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 938 cm⁻¹ is usually not enough for material identification by itself.
Penggunaan dunia sebenar
Jenis pertanyaan ini biasa dalam pengenalpastian polimer, saringan plastik tidak diketahui, penyelesaian masalah QC, pengesahan bahan kitar semula, dan semakan tugasan puncak yang disokong oleh literatur.
Kesilapan biasa
- Menganggap satu jalur terpencil sebagai bukti bahan tanpa memeriksa sekurang-kurangnya satu atau dua puncak sokongan.
- Mengabaikan pertindihan: pelbagai kumpulan berfungsi boleh menyumbang berhampiran nombor gelombang yang sama.
- Melangkau pengesahan apabila bahan tambahan, campuran, pengoksidaan, atau pencemaran boleh memesongkan spektrum.
Nasihat pengesahan
Apabila kekaburan masih ada, sahkan hipotesis dengan DSC, GC-MS, atau TGA, terutamanya untuk campuran, sampel terdegradasi, dan polimer terisi.
Literatur di sebalik penetapan ini
-
keyakinan 1.0
“The group of peaks from 3680 cm-1 to 3482 cm-1 intense spectral features at 938 and 3680 cm-1 correspond to the position of peaks that arise from OHstretching modes, where OHgroups are bound to Mg (serpentine and stitchtite) or Cr (stitchti”
Melchiorre 等 - 2020 - Insights on Structure and Threshold Detection Limi DOI: 10.3390/min10030215 -
Silicon (Si) keyakinan 1.0
“except cm-1 the band at 938 which may be due to the vibrations of Si-O bond stretching in SiO 4 N”
New Er3+ doped antimony oxide based glasses: thermal analysis, structural and spectral properties DOI: 10.1016/j.jallcom.2015.07.113 -
keyakinan 1.0
“cm-1 modes appear at 545 The peak at 938 corre- (cm-1) Wavenumber sponds to the asymmetric stretching mode of vibration of cm-1 Si-O-Si bonds.”
Synthesis and spectroscopic investigations of trivalent europium-doped M2SiO5 (M = Y and Gd) nanophosphor for display applications DOI: 10.1007/s10854-020-03076-5 -
Hydroxyl (O-H) keyakinan 1.0
“cm-1 913 characterize free B15C5 in the spectrum of a 0.5mol/L solution of B15C5 in dinated B15C5 at 913 cm-1, 938 cm-1, and 984 cm-1 (Figures 15b and S5) decreased, the intensity of the ν(OH) bands in the range of 3700-3500 cm-1 decreased”
Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-BasedIonic Liquid DOI: 10.3390/molecules28030935 -
Alkyl C-H keyakinan 1.0
“cm-1, The peaks related to C-H stretching vibration at 2901 O-H stretching vibration cm-1, at 3447 C-O stretching vibration from asymmetric oxygen bridge between 1057 cm-1, and 1113 C-O carbonyl stretching vibration from the glucose of the”
Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes DOI: 10.3390/ma15010170 -
Metal oxygen keyakinan 1.0
“cm1 cm-1 The peak at 938 is attributed to Sn-O-Si bond in stretching mode [5].”
Hijazi 等 - 2016 - Selective ammonia gas sensor based on SnO2-APTES m DOI: 10.1016/j.proeng.2016.11.193 -
Metal oxygen keyakinan 1.0
“The peak at 938 is cm-1 attributed to Sn-O-Si stretch [6].”
Modified SnO2-APTES gas sensor for selective ammonia detection at room temperature DOI: 10.1016/j.matpr.2018.10.424 -
Metal oxygen keyakinan 1.0
“The cm-1 peak at 938 is attributed to Sn-O-Si bond in stretching mode.”
Ambient temperature selective ammonia gas sensor based on SnO2-APTES modifications DOI: 10.1016/j.snb.2017.10.036
Ada spektrum dengan jalur ini?
Muat naik spektrum FTIR anda dan dapatkan laporan tafsiran penuh — penetapan puncak dengan petikan literatur, padanan perpustakaan, dan rantaian bukti berkadar keyakinan — dalam beberapa saat.