A Tetrairon Dication Featuring Tetraethynylbenzene Bridging Ligand: A Molecular Prototype of Quantum Dot Cellular Automata |
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Authors: | Dr. Rim Makhoul Dr. Paul Hamon Dr. Thierry Roisnel Dr. Jean-René Hamon Dr. Claude Lapinte |
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Affiliation: | Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, 35000 Rennes, France |
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Abstract: | The unprecedented tetrairon dication [{Cp*(dppe)FeC≡C-}4-μ-(1,2,4,5-C6H2)](PF6)2 ( 1 ) was obtained through a sequence of three reactions from 1,2,4,5-tetraethynylbenzene, Cp*(dppe)FeCl (Cp*=C5Me5, dppe=1,2-bis(diphenylphosphino)-ethane), KOtBu, and ferrocenium hexafluorophosphate. The cyclic voltammogram of the target molecule, isolated in 77 % yield, exhibits four well separated and reversible redox events showing that 1 is thermodynamically stable with respect to disproportionation (Kc>106). The tetranuclear dication 1 was characterized by XRD on single crystal, IR and NMR spectroscopies and Mössbauer spectrometry. The experimental data show that 1 behaves as a class II mixed-valence complex with the positive charges preferentially disposed on antipodal positions. This new molecule can be regarded as a potential molecular prototype of quantum dot cellular automata. |
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Keywords: | charge container mixed-valence organoiron quantum dot cellular automata tetraethynylbenzene bridge |
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