NEW STRUCTURES AND SYNTHETIC METHODS TO PERCONJUGATED SYSTEMS

The synthesizing of polymers containing conjugated -C=C- bonds begins with oxidative coupling, which in the early 60s developed through the different stages of polyaromatics and polyheteroaromatics to culminate in metal-like conducting polymers 1). Subsequent investigation showed that under oxidation conditions triphenylene structures are formed an d those structures stepwise assemble from low molecular, soluble to hi ghmolecular insoluble systems. Typical examples are heterocycles (pyrr ole, thiophene) or indophenin-reaction products between isatin and thi ophene 2) - now extended to thiophene containing terphenylenes 3) and cyclopentadienones. These materials are electrically conducting (0-10( +1) S/cm) (without any additional dopants) and have thermal stabilitie s up to 350-degrees-C. Synthesis of the starting compounds and condens ation conditions are described.