Preparation of poly(aryleneethynylene)–type copolymers containing flexible linking methylene units. Optical properties of the copolymers suggesting occurrence of energy transfer between π–conjugated local units
✍ Scribed by Takakazu Yamamoto; Keisuke Honda
- Book ID
- 101269603
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 165 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Palladium-catalyzed polycondensation between 2,5-diiodo-3-hexylthiophene I-Th(Hex)-I with mixtures of p-diethynylbenzene HCϵC-Ph-CϵCH and ␣,diethynylalkane HCϵC(CH 2 ) l CϵCH (l ϭ 3 or 8) gives poly(aryleneethynylene) PAE-type copolymers [CϵC(CH 2 ) l CϵC-Th(Hex)] m [CϵC-Ph-CϵC-Th(Hex)] n containing the methylene unit. The copolymers have a molecular weight (M n ) of about 1.2 ϫ 10 4 as determined by GPC (polystyrene standard) and are considered to possess essentially a random sequences in view of the -CϵC(CH 2 ) l CϵCO and -CϵC-Ph-CϵC-units as judged from their UV-visible spectra. By the incorporation of the (CH 2 ) l unit, the max position of the corresponding PAE homopolymer [CϵC-Ph-CϵC-Th(Hex)] n is shifted to a shorter wavelength. However, the copolymers give rise to a photoluminescence PL peak essentially agreeing with a PL peak of the homopolymer, suggesting occurrence of energy transfer in the copolymer.