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

A novel dinuclear platinum complex of (biC(12)ppy-fl)-Pt2C12DBM)(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-9H-fluorene-2,7-diyl)bis-(1,4-phenylene)]bis[3-(dodecyloxymethyl)pyridine] and C12DBM 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 X 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(C12DBM)(2) on the aligned polyimide at room temperature.