Abstract
The symmetrical bisferrocene 1,1,14,14-tetra-n-butyl-2,2,13,13,15,15,26,26-octamethyl-1,2,13,14,15,26-hexastanna[3.3]ferrocenophane ([(η5-C5H4)Fe(η5-C5H4SnMe2Sn(n-Bu)2SnMe2)]2, 8) was synthesized in good yield (82%) from the reductive coupling reaction of 1,1′-bis(dimethylstannyl)ferrocene, 6, with one equivalent of di-n-butylbis(diethylamino) stannane, 7a, at 0 °C in diethyl ether solution. Compound 8 is stable to ambient light but decomposes in the presence of moisture or chlorinated solvents. The title compound 8 was characterized by NMR (1H, 13C, 117Sn, 119Sn) spectroscopy, HRMS, and elemental analysis. A statistical model to account for the 117Sn/119Sn coupling patterns, observed in both the 117Sn and 119Sn NMR spectra, was undertaken and is a good fit to experimental data. Investigations by UV–vis spectroscopy display a visible d–d transition at λmax at 455 nm (e = 74 L mol–1 cm–1), while cyclic voltammetry reveals two reversible oxidation events at 0.01 and 0.23 V (relative to the ferrocene/ferroce...
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