Highly luminescent poly[(m-phenylenevinylene)-co-(p-phenylenevinylene)] derivatives synthesized via metathesis condensation (ADMET)

In this paper, we report on the synthesis of poly(phenylenevinylene)s conta ining m-linked phenylene groups in order to reduce the length of conjugatio n, which is an important tool to influence the color of photo- and electrol uminescence. Various substituted and unsubstituted divinylbenzenes and 4,4'-divinylbiphe nyl were synthesized as monomers. These were polymerized via diene metathes is condensation, acyclic diene metathesis (ADMET), using the fluorinated Sc hrock-type initiator [Mo(=NAr)(=C(H)CMe3)O(Me(CF3)(2))(2)]; (Ar = 2,6-diiso propyl-phenyl). The neat poly(phenylenevinylene)s suffer from a very low so lubility. To overcome this problem, substituents were introduced into the m onomers, and copolymerization was performed with exo, exo-norbornene-2,3-di oldiacetate. The polymers were characterized by H-1-NMR, FT-m, UV/VIS and G PC analysis. Photoluminescence (PL) spectra were taken and used to evaluate the photophysical properties of the oligomers and copolymers, which showed solid-state PL-quantum efficiencies of up to 52%. (C) 2000 Elsevier Scienc e B.V. All rights reserved.