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

Abstract

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-9H-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.

Recent progress in luminescent liquid crystal materials: design, properties and application for linearly polarised emission

“…Jiang et al designed a novel dinuclear platinum complex 22 (Figure 14), in which 1,6-bis((6-(4-(dodecyloxy)phenyl)pyridin-3-yl)oxy)hexane was used as cyclometalated ligand and 1,3-(1-n-hexyl,3-n-heptadecyl) diketone as ancillary ligand. 99 Complex 23 revealed a lamellar structure and a broad emission in the region of 450-700 nm both in CH 2 Cl 2 solution and as neat film. This crystalline binuclear platinum complex showed a transition to a smectic phase at relatively low temperature (42 o C).…”

An overview of phosphorescent metallomesogens based on platinum and iridium

“…Wang et al also reported a dinuclear platinum complex, in this case employing a conjugated fluorene moiety as the linking group (17, Figure 11). 61 This complex presented a smectic mesophase with relatively low transition temperature owing to the presence and relative orientation of the flexible chains. Complex 17 revealed a broad emission in the region of 450-700 nm both in CH2Cl2 solution and the neat film, which demonstrated that there was a strong intermolecular interaction leading to longwavelength emission.…”

Crystal structure of 6-ethoxypyridin-1-ium-2-olate

“…For general background to 2-iodo-5-hydroxypyridine derivatives and their applications, see: Cho et al (2003); Hegmann et al (2003); Savelon et al (1998); Wang et al (2012). For the synthesis of the title compound, see: Hutchinson et al (2001); Seton et al (2001 Table 1 Hydrogen-bond geometry (Å , ).…”