Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 20, Pages 10995-10999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp511296f
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Funding
- JSPS
- MEXT/JSPS [20111009, 24350063, 24750001]
- Asahi Glass Foundation
- Grants-in-Aid for Scientific Research [24750001, 20111009] Funding Source: KAKEN
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Electronic properties of ultrasmall gold clusters with defined nuclearity and geometrical structures have been a recent subject of interest not only with respect to the concept of molecularity but also because of their potential applicability as nanomaterials and catalysts. In this work, the electrochemical properties of dppp-protected octagold clusters ([Au8L4](n+) (L = dppp, n = 2 (1) and 4 (2), dppp = Ph2P(CH2)(3)PPh2) with charge-dependent geometrical structures were investigated. Unlike conventional spherelike centered clusters held by multiple spokes, the nonspoked Ails clusters displayed irreversible electrochemical profiles for the two-electron redox interconversion between 1 and 2, exhibiting a wide energy gap between the redox couples. This electrochemical irreversibility could be attributed to the significant alteration of electronic structures associated with the redox-coupled isomerization of the nonspoked cluster structures. In addition, we show that the coordinative interaction of Cl- anions with the Au-8 clusters notably affects both reduction and oxidation courses, providing an example of coordination-coupled electron transfer events.
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