Paul Shu

Synthesis of Δ2,2′-bithieno[3,4-d]-1,3-dithiole (DTTTF) and some of its charge-transfer salts

The title compound (DTTTF) was prepared by the coupling of the corresponding thieno-1,3-dithiolium salt, obtained from thieno-1, 3-dithiolane-2-thione synthesized from 3,4-dibromothiophen.

The Organic Metallic State: Some Chemical Aspects

Most crystalline organic compounds are insulators or semi-conductors with roan temperature conductivities in the range of 10-9 to 10-14Ω-1 cm-1 and exhibit exponentially decreasing conductivity profiles as the temperature is decreased.10 However in the 1960’s Melby and the duPont group made the startling discovery that a few of the many TCNQ (fig. 2) radical ion salts they prepared and studied11–17 had conductivities as high as 102Ω-1 cm-1. While this is low compared with metals like copper (σRT=5xl06 Ω-1 cm-1), it is remarkably high for an organic compound. Why do some of the TCNQ salts exhibit this high conductivity and can the conductivity of organic compounds be increased above 102Ω-1cm-1?

The Organic Metallic State1

Abstract The development of the organic metallic state is traced from our original synthesis and study of TTF-TCNQ to the new conductor HMTSF-TCNQ, the first organic substance which remains metallic as T → 0.

New synthesis of substituted diselenadithiafulvalenes (DSDTF) and tetraselenafulvalenes (TSF)

A new general synthesis of substituted diselenadithiafulvalenes (DSDTF)(VIIa) and tetraselenafulvalenes (TSF)(VIIb) is illustrated by the synthesis of hexamethylenediselenadithiafulvalene (HMDSDTF)(VIII).