title: New phosphorescent platinum(ii) complexes with tetradentate C*N^N*C ligands: liquid crystallinity and polarized emission.
abstract: New phosphorescent, liquid crystalline cyclometalated tetradentate platinum complexes (Pt-L16, Pt-L12 and Pt-L6) based on the tetradentate C*N^N*C ligands (C*N^N*C = 6,6'-bis(4-(alkoxy)-phenoxy)-2,2'-bipyridine) are designed and synthesized. Their crystal structure, and photophysical, electrochemical and liquid crystal characteristics were investigated. The X-ray structure of Pt-L12 shows a severe distortion of this complex towards a tetrahedral geometry. All complexes are emissive both in degassed solution and in the solid state at room temperature with emission maxima in the red region of the spectrum. Pt-L16 and Pt-L12 show monotropic smectic liquid crystal characteristics. Moreover, these liquid crystal complexes can be aligned on a rubbed nylon-6 glass substrate and produce polarized emission with a dichroic ratio of 5.1.
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Shilin
authors.identifier: http://orcid.org/0000-0001-9441-1246
authors.initials: S
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Kaijun
authors.initials: K
authors.lastname: Luo
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Hao
authors.initials: H
authors.lastname: Geng
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Hailiang
authors.initials: H
authors.lastname: Ni
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Wang
authors.affiliation: College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, China. Luo-k-j007@163.com.
authors.forename: Quan
authors.initials: Q
authors.lastname: Li