Electrochemical properties of palladium(0) complexes coordinated by quinone derivatives |
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| Authors: | Mitsuo Hiramatsu Hidehiko Nakano Tatsuo Fujinami Shizuyoshi Sakai |
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| Institution: | Department of Electronic Material Science, Graduate School of Electronic Science and Technology, Shizuoka University, Hamamatsu 432 Japan;Department of Industrial Chemistry, Faculty of Engineering, Shizuoka University, Hamamatsu 432 Japan;Department of Industrial Chemistry, Faculty of Engineering, and Department of Electronic Material Science, Graduate School of Electronic Science and Technology, Shizuoka University, Hamamatsu 432 Japan |
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| Abstract: | The polagrophic and cyclic voltammetric behavior of quinone derivatives (Q) and their palladium(0) complexes, (Q)1 or 2Pd(PPh3)2, has been studied. All free quinone derivatives except 5,8,9,10-tetrahydro-1,4-naphthoquinone (THNQ) showed two reversible waves, and all palladium(0) complexes showed irreversible waves. The reduction half-wave potentials for free quinone derivatives lie in the following order:7,7,8,8-tetracyanoquinodimethane (TCNQ) ? p-benzoquinone (BQ) ? 5,8-dihydro-1,4-naphthoquinone (DHNQ) ? 1,4-naphthoquinone (NQ) ? THNQ. The reduction potentials for quinone derivatives shifted toward the negative or coordination to palladium(0). The extents of the shifts depended on the electron-withdrawing ability of the free quinone derivatives. On the other hand, the oxidation potentials for the central palladium(0) in their complexes showed more positive values in comparison with the potential for Pd(PPh3)4. However, the oxidation potentials were almost constant for all complexes of the quinone derivatives. On the basis of these facts, the phenomena of charge transfer in the complexes are discussed. |
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