121Sb Mössbauer spectroscopic study on electronic states of pentavalent organoantimony compounds |
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| Authors: | Makoto Yanaga Kazutoyo Endo Toshio Shimizu Hiromichi Nakahara Masashi Takahashi Masuo Takeda |
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| Institution: | (1) Department of Chemistry, The Jikei University School of Medicine, Kokuryo, Chofu-shi, 182 Tokyo, Japan;(2) Higashitamagawagakuen, Showa College of Pharmaceutical Sciences, Machida-shi, 194 Tokyo, Japan;(3) Department of Chemistry, Tokyo Metropolitan University, Minamiosawa, Hachioji-shi, 192-03 Tokyo, Japan;(4) Department of Chemistry, Toho University, Miyama, Funabashi-shi, 274 Chiba, Japan |
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| Abstract: | A systematic study of pentavalent organoantimony compounds, (RC6H4)3SbX2 (R=H,p-CH3,p-F,p-Cl,p-CF3,o-CH3; X=Cl, Br), was carried out to examine the effect on Mössbauer parameters of the substituent on the aromatic ring. The Mössbauer parameters obtained in polycrystalline form reflected the steric effect caused by the position of the substituent on the aromatic ring. On the other hand, measurements in frozen organic solutions revealed that the electron density and electric field gradient at and around the antimony nucleus became smaller when the more electron-attractive group was introduced into thepara position. |
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