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π‐conjugated polymers prepared by organometallic polycondensation and metal complexes of the polymers
Author(s) -
Yamamoto Takakazu,
Nakajima Hisashi,
Hayashida Naoki,
Shiraishi Kouichi,
Kokubo Hisashi
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<658::aid-pat17>3.0.co;2-u
Subject(s) - conjugated system , condensation polymer , polymer , materials science , monomer , polymer chemistry , dopant , metal , photochemistry , doping , chemistry , metallurgy , composite material , optoelectronics
Organometallic dehalogenative polycondensation of dihaloaromatic compounds produces various π‐conjugated polymers. π‐Conjugated polymers with nitrogen in the aromatic ring form metal complexes, and regioregular π‐conjugated polymers such as head‐to‐tail poly(3‐hexylthiophene‐2,5‐diyl) (HT‐P3HexTh), form a stacked structure. New examples are given in this paper. Poly(1,5‐naphthyridine‐2,6‐diyl) (P(2,6‐Nap)) formed a complex with Ru(bpy) 2 2+ ( bpy = 2,2′‐bipyridine). The molar ratio between the monomeric unit and Ru(bpy) 2 2+ in the formed complex was about 1 : 1, and the complex showed overlapped absorption bands in the region 370–460 nm. Dehalogenative polycondensation of a porphyrinatozinc(II) complex having two 5‐bromo‐2‐thienyl units at the 5,15‐positions gave a new porphyrinatozinc(II) polymer. The polymer exhibited a strong B absorption band at 416 nm and two weak Q bands at 546 and 584 nm. The polymer emitted light at the onset position of the Q bands (591 nm) when irradiated with 424 nm UV light; this result indicated occurrence of a transfer of energy absorbed at the B band to an excited state concerned with the Q bands. A cast polymer film was electrochemically active both in the oxidation and reduction regions. Electrochemically p‐doped HT‐P3HexTh formed a stacked structure, similar to neutral HT‐P3HexTh. The p‐doped HT‐P3HexTh (dopant BF 4 – showed an electrical conductivity of 7.3 × 10 −3 S cm −1 at room temperature. Copyright © 2000 John Wiley & Sons, Ltd.