New radical salts of diferrocenyl-VT (VT: bis(vinylenedithio)tetrathiafulvalene)

被引:20
作者
Lee, HJ
Noh, DY [1 ]
Underhill, AE
Lee, CS
机构
[1] Seoul Womens Univ, Dept Chem, Seoul 139774, South Korea
[2] Univ Wales, Dept Chem, Bangor LL57 2UW, Gwynedd, Wales
[3] Pukyong Natl Univ, Dept Phys, Pusan 608737, South Korea
关键词
D O I
10.1039/a902690h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 BF4-. 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.(BF4)(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 HBF4, the extended pi-electron system of VT is degraded into the TTF system. The electrical conductivities of pressed pellets of the radical cationic salts are 7 x 10(-3) S cm(-1).
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页码:2359 / 2363
页数:5
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