The Electrochemical Behavior of the Low-valent Transition Metal Complexes. II. Iron(0)-2,2′-Bipyridine Complexes

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概要

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• The electroreduction reaction of the zero-valent iron-2,2′-bipyridine complexes (Fe(bipy)<SUB>2</SUB> and Fe(bipy)<SUB>3</SUB>) was studied in a hexamethylphosphoric triamide solution by polarography and ESR measurements. In the polarography, Fe(bipy)<SUB>2</SUB> was first reduced at a very less negative potential (E<SUB>1⁄2</SUB>=−0.76V <I>vs.</I> Hg pool) than the first wave potential of free bipyridine (−2.37 V <I>vs.</I> Hg pool). In the presence of excess bipyridine, Fe(bipy)<SUB>2</SUB>was first reduced at −1.10 V <I>vs.</I> Hg pool corresponding to the second reduction step of the solution of Fe(bipy)<SUB>2</SUB>. The visible spectra of the solution of Fe(bipy)<SUB>2</SUB> in the presence of excess bipyridine was different from that of the solution of Fe(bipy)<SUB>2</SUB> only. The signal with hyperfine structure attributable to the anion radical of bipyridine was observed by means of ESR analysis of the solution electrolyzed at the potential corresponding to the second reduction step. From these results, it was concluded that [Fe(bipy)(HMPT)<SUB>m</SUB>] was reduced at the first step, and [Fe(bipy)<SUB>2</SUB>(HMPT)] was reduced at the second.

• 公益社団法人 日本化学会の論文

著者

• Hidai Masanobu

  Department Of Chemistry And Biotechnology Graduate School Of Engineering The University Of Tokyo

• Yamagishi Takamichi

  Department Of Applied Chemistry Graduate School Of Engineering Tokyo Metropolitan University

• Misono Akira

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

• Uchida Yasuzo

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

• Kageyama Hironori

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

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