Regioregular puly(1-butoxy-2

4-m-phe“ylenevinylene) was synthesized by Wittig reaction with salicylaldehyde as the starting material

and its pmperties were compared with poly(2

5-dibutoxy．1．4-p-phenylenevinylene-alter-p-phenylenevinylene) (Bu-PPV) and poly(2

5-dibutoxy-1

4-p-phenylenevinylene-alter-m-henyknevinylene) (Bu-PMPV)．The results showed that the introduction of m-phenylene could obviously improve the solubility．Thus

the solubility of Bu-PMPV was almost one order of magnitude higher than that of Bu-PPV．and Bu-MPV had a solubility 2～5 times of that of Bu-PMPV．The introduction of m-phenylene also caused obvious blue-shifts in the UV-Vis absorption and fluorescence spectra．The UV-Vis spectrum of Bu-MPV in CHCl

showed one absorption band λmax at 316 am．The fluorescence of Bu-MPV solution in CHCl3 exhibited a very narrow emissiorl peak with emission maxima at about 419 and 434 nm

the full width at half-maximum of the emission peak is about 60 nm.