A Co-59 nuclear magnetic resonance study of the interaction of lanthanoid shift reagents with tris(.BETA.-diketonato)-cobalt(III) complexes.

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概要

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• Ln(fod)<SUB>3</SUB> (Ln=La, Pr, Nd, Sm, and Eu)-induced <SUP>59</SUP>Co shifts (δ<SUB>Co</SUB>) for a series of tris(β-diketonato)Co(III) complexes were determined directly from separate observations of the free complexes and 1 : 1 adducts with Ln(fod)<SUB>3</SUB> at room temperature (25 °C) in CHCl<SUB>3</SUB>; Ln(dpm)<SUB>3</SUB>-induced shifts were also observed in CCl<SUB>4</SUB>. Values of δ<SUB>Co</SUB> corrected for the adduct-formation shifts (δ′<SUB>Co</SUB>) are separated into contact and pseudo-contact contributions by using the intercept and slope in a linear plot of δ′<SUB>Co</SUB>⁄<<I>S</I><SUB>z</SUB>> <I>vs.</I> <I>D</I>⁄<<I>S</I><SUB>z</SUB>>. It is suggested from the estimated hfs constant of <SUP>59</SUP>Co (≈−0.2 G, 10<SUP>−4</SUP>T) that the spin polarization mechanism may be predominant for the electron spin transfer from Ln ion into Co ion.

• 公益社団法人 日本化学会の論文

著者

• Fujii Yuki

  Department Of Chemistry Faculty Of Science Ibaraki University

• NAKANO Yoshiharu

  Department of Chemistry, Faculty of Science, Ibaraki University

• Hirayama Masatoshi

  Department Of Chemistry Faculty Of Science Ibaraki University

• FUJII Yuki

  Department of Chemistry, Faculty of Science, Ibaraki University

• Kawamata Yoshimichi

  Department of Chemistry, Faculty of Science, Ibaraki University

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