Half‐Sandwich Iridium Complexes Bearing a Diprotic Glyoxime Ligand: Structural Diversity Induced by Reversible Deprotonation

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  • Taishin Takamura
    Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
  • Takuya Harada
    Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
  • Tatsuro Furuta
    Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
  • Takao Ikariya
    Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
  • Shigeki Kuwata
    Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan

抄録

<jats:title>Abstract</jats:title><jats:p>Synthesis and deprotonation reactions of half‐sandwich iridium complexes bearing a vicinal dioxime ligand were studied. Treatment of [{Cp*IrCl(μ‐Cl)}<jats:sub>2</jats:sub>] (Cp*=η<jats:sup>5</jats:sup>‐C<jats:sub>5</jats:sub>Me<jats:sub>5</jats:sub>) with dimethylglyoxime (LH<jats:sub>2</jats:sub>) at an Ir:LH<jats:sub>2</jats:sub> ratio of 1:1 afforded the cationic dioxime iridium complex [Cp*IrCl(LH<jats:sub>2</jats:sub>)]Cl (<jats:bold>1</jats:bold>). The chlorido complex <jats:bold>1</jats:bold> undergoes stepwise and reversible deprotonation with potassium carbonate to give the oxime–oximato complex [Cp*IrCl(LH)] (<jats:bold>2</jats:bold>) and the anionic dioximato(2−) complex K[Cp*IrCl(L)] (<jats:bold>3</jats:bold>) sequentially. Meanwhile, twofold deprotonation of the sulfato complex [Cp*Ir(SO<jats:sub>4</jats:sub>)(LH<jats:sub>2</jats:sub>)] (<jats:bold>4</jats:bold>) resulted in the formation of the oximato‐bridged dinuclear complex [{Cp*Ir(μ‐L)}<jats:sub>2</jats:sub>] (<jats:bold>5</jats:bold>). X‐ray analyses disclosed their supramolecular structures with one‐dimensional infinite chain (<jats:bold>1</jats:bold> and <jats:bold>2</jats:bold>), hexagonal open channels (<jats:bold>3</jats:bold>), and a tetrameric rhomboid (<jats:bold>4</jats:bold>) featuring multiple intermolecular hydrogen bonds and electrostatic interactions.</jats:p>

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