π-Conjugated Charge Transfer Polymer Constituted of Electron-donating Thiophene and Electron-withdrawing Quinoxaline

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Abstract
Palladium-catalyzed polycondensation between 2,5-bis(trimethylstannyl)thiophene and 5,8-dibromoquinoxaline derivatives gives soluble new π-conjugated polymers, which exhibit absorption bands at 575 ± 30 nm assignable to intramolecular charge transfer bands and show the three-photon resonant third-order nonlinear optical susceptibility χ(3) of about 5 × 10−11 esu.