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Synthesis and charge carrier photogeneration in novel ladder polymers containing 2,5‐thienylene units
Author(s) -
Forster Michael,
Pan Junyou,
Annan Kenneth O,
Haarer Dietrich,
Scherf Ullrich
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200009)49:9<913::aid-pi361>3.0.co;2-8
Subject(s) - arylene , polymer , phenylene , materials science , poly(p phenylene) , stille reaction , polymer chemistry , photochemistry , excitation , aryl , chemistry , organic chemistry , physics , alkyl , composite material , quantum mechanics
This paper describes the synthesis of aromatic ladder polymers containing main chain 2,5‐thienylene moieties. A suitably substituted single‐stranded intermediate of these novel poly(1,4‐phenylene‐2,5‐thienylene) ladder polymers (LPPPT) was created by aryl‐heteroaryl cross coupling according to Stille, and subsequently cyclized to the final ladder structure. The replacement of 1,4‐phenylene by 2,5‐thienylene moieties in arylene ladder polymers leads to a distinct reduction in the excitation energy from 2.78 eV for all ‐phenylene to 2.33 eV for alternating phenylene/thienylene ladder polymers. The photogeneration of charge carriers was investigated by xerographic measurements. LPPPT shows a charge generation quantum efficiency of about 1%, nearly independent of the excitation wavelength. © 2000 Society of Chemical Industry