Nuclear Quadrupole Resonances in Arsenic and Antimony Trihalides and Sulphur Molecular Addition Compounds

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Nuclear quadrupole resonances of I, Br, Cl, As and Sb isotopes in solids AsCl_3, SbCl_3, SbBr_3, AsI_3, SbI_3, AsI_3・3S_8, SbI_3・3S_8, SnI_4, SnI_4・2S_8 and SnI_4・4S_8 have been measured systematically. The newly obtained coupling constants eQq and asymmetry parameters η of the I^127 resonances at 77°K are as follows: eQq = 1383.03, 1402.68Mc: η = 0.002, 0.039 in SnI_4・2S_8, eQq = 1364.3, 1368.3, 1405.0Mc and η = 0.00, 0.00, 0.03 in SnI_4・4S_8. In SnI_4・4S_8 an additional line was observed at 219.04Mc corresponding to the first resonance. The second resonance of SbI_3 was at 254.637Mc with eQq = 895.83Mc and η = 0.565. Resonance frequencies of As^75 in AsI_3 and AsI_3・3S_8 at 77°K were 29.338 and 49.501Mc, respectively. The first resonance of Sb^<121> in SbI_3 was 25.406Mc at 77°K and the corresponding resonance in SbI_3・3S_8 was 37.461Mc at 297°K. SbBr_3 showed two crystal forms which gave Sb^<121> coupling constants of 319.920 and 316.02Mc and asymmetry parameters of 0.082 and 0.182 at 304°K, respectively. On the Br resonances of SbBr_3 three resonance lines instead of two hitherto reported were observed in both crystal forms. Coupling constants of trihalides were compared with their chemical bond properties. The constants of AsI_3 and SbI_3 are different from those of other compounds, while their sulphur moleculor addition compounds are in rather good agreement. AsI_3 showed positive temperature dependency for arsenic isotope as for the case of iodine isotope.
社団法人日本物理学会の論文
1958-06-05

Nuclear Quadrupole Resonances in Arsenic and Antimony Trihalides and Sulphur Molecular Addition Compounds

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