Electron paramagnetic resonance study of S3− formed on magnesium oxide
1973; American Institute of Physics; Volume: 58; Issue: 5 Linguagem: Inglês
10.1063/1.1679473
ISSN1520-9032
AutoresJack H. Lunsford, Dennis P. Johnson,
Tópico(s)Inorganic Fluorides and Related Compounds
ResumoElemental sulfur reacts at 400° with partially hydroxylated magnesium oxide to form a stable paramagnetic species which has been identified as the S3− ion. The 33S hyperfine splitting is characteristic of an aba type molecule with a‖ (a)=20.7 G, a‖ (b)=39.6G, a⊥ (a)=3.7 G, and a⊥ (b)=7.5G. The principal g values are g‖=2.004 and g⊥=2.043. The g and hyperfine tensors suggest that at 77°K the molecule is librating in the plane of the three sulfur atoms. The formation of S3− is accompanied by the evolution of H2S and the loss of another sulfur radical which is believed to be a polymeric form of sulfur, Sn. These observations suggest that the reaction Sn+4OH−→ 2H2S+2S3−+SO4−+Sn-6 may occur at the surface.
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