The 19F solid-state high-resolution nuclear magnetic resonance study of K2SiF6, K2GeF6, and K2SnF6.
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概要
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High-resolution <SUP>19</SUP>F NMR experiments were carried out on K<SUB>2</SUB>SiF<SUB>6</SUB>, K<SUB>2</SUB>GeF<SUB>6</SUB> and K<SUB>2</SUB>SnF<SUB>6</SUB>, and the chemical shift shielding tensors were determined. In all three substances, the shielding tensors are axially symmetric, and the most shielded direction is parallel to the MF (M=Si, Ge, and Sn) bond. The values of the shielding tensor elements (σ<SUB>⁄⁄</SUB> and σ<SUB>⊥</SUB>) change systematically from K<SUB>2</SUB>SiF<SUB>6</SUB> to K<SUB>2</SUB>SnF<SUB>6</SUB>, except for the σ<SUB>⊥</SUB> component of K<SUB>2</SUB>SiF<SUB>6</SUB>, which is very large compared with those in the Ge and Sn-complexes. The analysis of σ’s by a simple MO treatment indicates that π-backbonding is the strongest in the Si-F bond, probably because of the extraordinarily low electronegativity of Si. At room temperature, the reorientation of MF<SUB>6</SUB><SUP>2−</SUP> anions is rapid enough to average out the shielding tensor components in the Si and Sn-complexes.
著者
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Nakamura Nobuo
Department Of Cardiology Seiyu Memorial Hospital
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Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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Yoshioka Yoshichika
Department of Chemistry, Faculty of Science, Osaka University
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