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Updated: Jun 26, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Infrared spectrum of nitrobenzene anion in solid argon
Renhu Ma1, Dongmei Yuan, Mohua Chen
1Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Advanced Materials Laboratory, Fudan University, Shanghai 200433, PR China.
Abstract:
The infrared spectrum of the nitrobenzene anion isolated in solid argon is presented. The nitrobenzene anion was prepared by co-deposition of a nitrobenzene/Ar mixture with high-frequency discharged argon at 4 K. Photosensitive absorptions are assigned to different vibrational modes of the nitrobenzene anion on the basis of isotopic substitutions ((15)N and deuterium), as well as theoretical calculations. The anion loses one electron to give the neutral nitrobenzene upon visible light (500 < lambda < 600 nm) irradiation. Theoretical calculations predicated that the anion has a planar C(2v) symmetry with a shorter C-N bond and longer N-O bonds relative to those of neutral nitrobenzene.
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Comparing the stretching vibrational frequency of C≡C triple bonds with that of double and single bonds, it is evident that C≡C triple bonds exhibit a higher stretching frequency than C=C double and C–C single bonds. Similarly, the C≡N triple bond exhibits higher stretching absorption than the C=N...