Syntheses and thermal properties of some bivalent transition metal complexes with 1,4-diazabicyclo[2.2.2]octane.
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概要
- 論文の詳細を見る
New five-coordinate complexes [MCl<SUB>3</SUB>L(H<SUP>+</SUP>L)], where M=Mn(II), Fe(II), Co(II), and Ni(II) and L=1,4-diazabicyclo[2.2.2]octane, were prepared in anhydrous ethanol. On being heated in the solid state, they begin to lose the non-charged ligand (L) in the order Co(147 °C) <<Fe(184 °C)<Ni(190 °C)<Mn(196 °C) and are transformed into the tetrahedral complexes [MCl<SUB>3</SUB>(H<SUP>+</SUP>L)]. The thermal stability of the five-coordinate complexes depends markedly on the nature of M(II). The octahedral complex [NiCl<SUB>4</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>]H<SUB>2</SUB>L·H<SUB>2</SUB>O obtained from an aqueous solution shows a series of complicated color and structural changes on heating according to step-wise decomposition: [NiCl<SUB>4</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>]H<SUB>2</SUB>L·H<SUB>2</SUB>O (greenish yellow, octahedral)→[NiCl<SUB>4</SUB>]H<SUB>2</SUB>L(light blue, tetrahedral)→[NiCl<SUB>3</SUB>(H<SUP>+</SUP>L)](cobalt blue, tetrahedral)→[NiCl<SUB>2</SUB>L<SUB>1⁄2</SUB>](reddish brown, probably square-pyramidal)→NiCl<SUB>2</SUB>(yellow, octahedral).
- 公益社団法人 日本化学会の論文
著者
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Sone Kozo
Department Of Chemistry Faculty Of Science Josai University
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Nagase Kenzo
College of General Education, Tohoku University
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Yokobayashi Hiroko
College of General Education, Tohoku University
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