Soluble and processable conjugated polyazines with oligo(p-phenylene vinylene)s

摘要

An efficient polycondensation reaction between alpha,omega-diformyl functional aromatics,namely 2,5-diheptyloxy-1,4-diforrnylbenzene and side-chain substituted alpha,omega-diformyl oligo(p-phenylene vinylene) (OPV) with hydrazine afforded novel soluble and processable conjugated polymers,P1 and P2,respectively.The reaction conditions were investigated and structural analysis of the polymers was carried out by means of 1H,13C,15N NMR,indicating all-trans configured C=N-N=C linkages.The molecular weights M_n were observed at ~1100-1400 g/mol for P1 and approx 8700-10,500 g/mol for P2.The optical properties showed absorption maxima at ~455 nm and ~487 nm for P1 and P2 (CHC13 solutions),respectively,red shifted by 31-60 nm relative to the monomer aromatics due to conjugation through the azine linkage.The emission maxima are observed at ~515 nm and ~560 nm for P1 and P2 (CHC13 solutions),respectively.Thin films of P2 readily undergo n-doping.