Highly Dichroic Metallomesogen of Dinuclear Platinum Complex: Synthesis and Liquid Crystal and Photophysical Properties

A novel dinuclear platinum complex of (biC 12 ppy-fl)Pt 2 C 12 DBM) 2 with liquid crystal luminescent property has been prepared, as well as its liquid crystal, optophysical properties and hole mobility have been studied, where biC 12 ppy-fl is 6,6′-[4,4′-(9,9-didodecyl-9 H -fluorene-2,7-diyl)bis(1,4-phenylene)]bis[3-(dodecyloxymethyl)pyridine] and C 12 DBM is 1,3-bis[4-(dodecyloxy)phenyl]propane-1,3-dione. This dinuclear platinum complex displayed a smectic mesophase and excellent opto-physical properties. Compared to the reported mononuclear platinum complex of (C n ROppy)Pt(acac) (R = H, F), this dinuclear platinum complex exhibited higher emission quantum yield and higher stability, as well as higher hole mobility of 8.4 × 10 –4 cm 2 /(V s). Moreover, a highly polarized ratio of 10.3 was obtained for the aligned film of (biC 12 ppy-fl)Pt 2 (C 12 DBM) 2 on the aligned polyimide at room temperature.