Orientation-dependent 1H and 13C isotropic shifts of low-spin tetracyano(1,2-diamine)ferrates(III).
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概要
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Paramagnetic <SUP>1</SUP>H and <SUP>13</SUP>C NMR signals of low-spin tetracyanodiamineferrates(III), [Fe<SUP>III</SUP>(CN)<SUB>4</SUB>(diamine)]<SUP>−</SUP>, containing ethylenediamine, (<I>R</I>)-1,2-propanediamine, (1<I>R</I>,2<I>R</I>)-<I>trans</I>-cyclohexanediamine, and <I>N</I>,<I>N</I>′-dimethylethylenediamine, were assigned by the use of rapid electron exchange between the Fe<SUP>III</SUP> complex and the diamagnetic Fe<SUP>II</SUP> complex with an identical set of ligands. The C–H on the five-membered chelate ring showed isotropic shifts with different signs depending on their orientations: 14–18 ppm downfield and ca. 16–23 ppm upfield for axial and equatorial protons respectively. The isotropic shifts for the <SUP>13</SUP>C nuclei were attenuated, their signs alternating with each separation by one carbon-carbon bond from the metal ion. The isotropic shift is compared with that of the Ni<SUP>II</SUP> complex qualitatively in terms of the dipolar and Fermi contact shifts.
- 公益社団法人 日本化学会の論文
著者
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Sakai Tomoya
Faculty Of Pharmaceutical Sciences Nagoya City University
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Goto Masafumi
Faculty Of Pharmaceutical Science Kumamoto University
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Kuroda Yoshitaka
Faculty of Pharmaceutical Sciences, Nagoya City University
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