Abstract
Two esters of succinic acid containing a thioxanthene unit as an electron-transporting moiety and a 4-dicyanovinylaniline (THEH-DCVA) or 4-nitrovinylaniline unit (THEH-NVA) as an electro-optically (EO) active chromophore were successfully synthesized. The obtained succinates form stable amorphous films at room temperature. These compounds have absorption coefficients of 6.7 and 21.5 cm −1 at 633 nm and glass transition temperatures of 11 and 14 °C for THEH-DCVA and THEH-NVA, respectively. Optical absorption is due to electric charge transfer interaction between an electron-accepting thioxanthene moiety and an electron-donating EO active chromophore. The synthesized compounds without photosensitizers, a plasticizer, and polymer binder showed photorefractivity. A large coupling gain (140 cm −1 at 93 V/μm) was observed for THEH-NVA.
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