Preparation of a new poly(p-phenylene) type polymer, poly(pyrazine-2,5-diyl), with a coplanar structure

Poly(pyrazine-2,5-diyl), PPyrz, was prepared by organometallic dehalogenative polycondensation of 2,5-dibromopyrazine. PPyrz was soluble in conc. H2SO4 and showed an eta/c value of 0.45 dl g(-1). PPyrz exhibited the UV-vis peak at the longest wavelength (lambda(max) = 439 nm) among the poly(p-phenylene) type polymers. The polymer afforded a simple CP-MAS solid C-13 NMR pattern with peaks at delta 143.3 and 148.5. Microwave-assisted synthesis was effective. (C) 2003 Elsevier Science Ltd. All rights reserved.