Abstract
1,1′-Diferrocenyl-VT 5 is successfully prepared by phosphite-based coupling reaction of ferrocenyl 1,3-dithiol-2-one 4. It shows one reversible cyclic voltammogram with E pa = 0.66 V and forms radical cation salts with I 3 – and BF 4 – . In compound 5·(I 3 ), according to the temperature-controlled EPR and Mossbauer measurements, the VT moiety is oxidised to form a radical, while the two ferrocene groups are not oxidized. In compound 5H·(BF 4 ) 4 , however, a mixed ferrocene/ferrocenium system consisting of low-spin Fe(II), high-spin Fe(II) and Fe(III) is detected by Mossbauer spectroscopy. Due to the protonation of VT by HBF 4 , the extended π-electron system of VT is degraded into the TTF system. The electrical conductivities of pressed pellets of the radical cationic salts are 7 × 10 –3 S cm –1 .
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