Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17594
Title: Electronic communications mediated by metal clusters
Authors: Yip, JHK
Wu, J
Wong, KY 
Ho, KP
Pun, CSN
Vittal, JJ
Keywords: Electrochemistry
Electronic communication
Mixed valency
Molecular wire
Issue Date: 2004
Source: Journal of the Chinese Chemical Society, 2004, v. 51, no. 5 B, p. 1245-1252 How to cite?
Journal: Journal of the Chinese Chemical Society 
Abstract: Two model systems [CuI3(dppm) 3(μ3-η1-C≡CFc)2] ·PF6 (1·PF6) and [PtI 2(dppm)2(C≡CFc)2] (2) were devised to probe the ability of metal clusters in mediating electronic communications. The complexes were characterized by using single-crystal X-ray diffraction, UV-vis spectroscopy, and voltammetry (dppm = bis(diphenylphosphino)methane; Fc = ferrocenyl). The complex is composed a of trimetallic CuI3 core bridged by three dppm and capped with one and two ferrocenylacetylides, respectively. Cyclic and differential pulse voltammograms of 1·PF 6 show two reversible Fc oxidations separated by 110 ± 14 mV, giving a comproportionation constant Kc of 77 ± 30. The stability of the mixed-valence complex 12+ arises mainly from the reduction of electrostatic repulsion and statistical distribution. On the other hand, the Pt-Pt σ-bond enhances electronic interactions between the terminal Fc-groups in compound 2. The CV of the complex shows two reversible Fc-centered oxidations which are separated by 267 ± 14 mV and the K c is 3.3 × 104 ± 1.5 × 104. Addition of a d10 AuCl/Br fragment to the Pt-Pt bond gives rise to complexes [Pt2(μ-AuX)(dppm)2(C≡CFc)2] [X = Cl (3) and Br (4)]. The two Fc-oxidations are not resolved in the CV of the complexes, indicating that the electronic communication is shut down.
URI: http://hdl.handle.net/10397/17594
ISSN: 0009-4536
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