Synthesis and thermal properties of regio- and stereoregular poly(silylene-1,4-phenylenevinylene)s

摘要

Communication: Polymerization of p-(dimethylsilyl)-phenylacetylene in toluene at 25 and 80 degreesC using RhI(PPh3)(3) as the catalyst afforded highly regio- and stereoregular poly(dimethylsilylene-1,4-phenylenevinylene)s (cis-3a and trans-3a) containing 98 cis- and 99 trans-vinylene moieties, respectively. Similarly, poly(butylmethylsilylene-1,4-phenylenevinylene)s (3b with 91 cis- and 95 trans-structures) and poly(diisopropylsilylene-1,4-phenylenevinylene) with 95 trans-structure were synthesized. All polymers were soluble in common organic solvents, The trans-type polymers showed red shifts and hyperchromic effects in the UV-visible spectrum. The onset temperature of weight loss (T-0) of cis-3a was much higher than that of trans-3a. References: 14