Novel poly(p-phenyleneethynylenevinylene)s (PPEV) have been synthesized by step-growth oligomerization of 2,5-diethynyl-1,4-dialkoxybenzene monomers promoted by the ruthenium pre-catalyst [{RuCl(m-Cl)(p-cymene)}] in the solvent mixture AcOH/CHCl. The presence of the branched side chains 2-ethylhexyloxy or 3,7-dimethyloctyloxy in the phenylene unit allows for the formation of soluble conjugated short polymers, with slightly increased degree of polymerization (X = 5 - 10) and red-shifted photophysical properties (lambda 515 nm in CHCl) with respect to the analogues with linear alkoxy side chains. The aggregation properties of the polymer with 2-ethylhexyloxy groups have been investigated by an osmosis driven procedure, yielding nanospheres of different size depending on the adapted solvent/nonsolvent mixture.
Synthesis and characterization of stereoregular conjugated polyarylenynes, (-Ar-(E)-CH=CHC-C-)n, decorated with branched bis-alkoxy side chains
D'Acunzo F;Bassetti M
2020
Abstract
Novel poly(p-phenyleneethynylenevinylene)s (PPEV) have been synthesized by step-growth oligomerization of 2,5-diethynyl-1,4-dialkoxybenzene monomers promoted by the ruthenium pre-catalyst [{RuCl(m-Cl)(p-cymene)}] in the solvent mixture AcOH/CHCl. The presence of the branched side chains 2-ethylhexyloxy or 3,7-dimethyloctyloxy in the phenylene unit allows for the formation of soluble conjugated short polymers, with slightly increased degree of polymerization (X = 5 - 10) and red-shifted photophysical properties (lambda 515 nm in CHCl) with respect to the analogues with linear alkoxy side chains. The aggregation properties of the polymer with 2-ethylhexyloxy groups have been investigated by an osmosis driven procedure, yielding nanospheres of different size depending on the adapted solvent/nonsolvent mixture.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
