Issue 19, 2013
From the journal:

Dalton Transactions

Preparation of tetrabutylammonium salt of a mono-Ru(iii)-substituted α-Keggin-type silicotungstate with a 4,4′-bipyridineligand and its electrochemical behaviour in organic solvents†

Shuhei Ogo,a   Sachie Moroi,a   Tadaharu Ueda,b   Kenji Komaguchi,a   Shinjiro Hayakawa,a   Yusuke Ide,a   Tsuneji Sanoa  and  Masahiro Sadakane*ac  

* Corresponding authors

a Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Japan
E-mail: sadakane09@hiroshima-u.ac.jp

b Department of Chemistry, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan

c Japan Science and Technology Agency (JST), PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, Japan

Abstract

The tetrabutylammonium (TBA) salt of a mono-ruthenium(III)-substituted α-Keggin-type silicotungstate with a 4,4′-bipyridine (bipy) ligand, TBA5[α-SiW11O39RuIII(bipy)] (1), which is soluble in various organic solvents, was prepared by a cation exchange reaction of Cs5[α-SiW11O39RuIII(bipy)] with tetrabutylammonium bromide. Compound 1 was characterised using IR, 1H-NMR, elemental analysis, single crystal X-ray analysis, X-ray absorption near-edge structure (XANES) analysis (Ru L3-edge), electron spin resonance (ESR), cyclic voltammetry (CV) and UV-Vis. Single crystal X-ray analysis of 1 revealed that the RuIII unit was incorporated into the α-Keggin-type silicotungstate framework and coordinated by a bipy molecule through a Ru–N bond. CV indicated that the incorporated RuIII-bipy was reversibly oxidised to the RuIV-bipy derivative and reduced to the RuII-bipy derivative in organic solvents. The redox potential of RuIV/III-bipy was found to be affected by organic solvents. Moreover, the RuV-bipy derivative was observed in acetonitrile.

Graphical abstract: Preparation of tetrabutylammonium salt of a mono-Ru(iii)-substituted α-Keggin-type silicotungstate with a 4,4′-bipyridine ligand and its electrochemical behaviour in organic solvents

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Article information

DOI
https://doi.org/10.1039/C3DT50300C
Article type
Paper
Submitted
30 Jan 2013
Accepted
07 Mar 2013
First published
08 Mar 2013

Dalton Trans., 2013,42, 7190-7195

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Preparation of tetrabutylammonium salt of a mono-Ru(III)-substituted α-Keggin-type silicotungstate with a 4,4′-bipyridine ligand and its electrochemical behaviour in organic solvents

S. Ogo, S. Moroi, T. Ueda, K. Komaguchi, S. Hayakawa, Y. Ide, T. Sano and M. Sadakane, Dalton Trans., 2013, 42, 7190 DOI: 10.1039/C3DT50300C

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