Abstract
Poly(2-ethynylthiophene) was stereoregularly prepared with a Rh complex catalyst, [Rh(norbornadiene)Cl]2, to selectively produce the cis−transoid isomer in high yields when triethylamine was used as the polymerization solvent at 20 °C. Photoinduced cis-to-trans isomerization was newly found to take place when the film of a pristine cis−transoid polymer was photoilluminated using a Xe lamp with light of wavelength, 320−500 nm under vacuum for 5 h. The cis and trans polymers obtained before and after the illumination were characterized in detail using 1H NMR, UV−vis of solution and film, and electron spin resonance methods.
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