Effects of aromatic core and flexible terminal chain structures on the properties of luminous liquid-crystalline gold(i) complexes for functional materials. (11th February 2018)

• Record Type: Journal Article
• Authors: Anukul, Preeyanuch; Sugimoto, Nana; Sakamoto, Kaho; Rokusha, Yuki; Taneki, Kensuke; Fujisawa, Kaori; Tsutsumi, Osamu
• Is Part Of: Molecular crystals and liquid crystals. Volume 662(2018)
• Page Start: 176
• Page End: 187
• Publication Date: 2018-02-11
• Subjects: Aggregation-induced emission -- Au(I) complex/ luminescence -- liquid crystal; Molecular crystals -- Periodicals; Liquid crystals -- Periodicals; Liquid crystals; Molecular crystals; Periodicals; 548
• DOI: 10.1080/15421406.2018.1467615
• Languages: English
• ISSNs: 1542-1406

Abstract

ABSTRACT: Luminescent liquid-crystalline (LC) Au complexes with various aromatic cores and flexible terminal chains were synthesized. The aromatic core aspect ratio crucially affected the LC temperature range and melting point of the complexes. Moreover, branched flexible chains reduced the melting point, thus expanding the LC temperature range. In the crystalline and LC phases of the complexes, fluorescence was quenched by the aggregation-caused quenching effect, but phosphorescence was enhanced by the crystallization-induced phosphorescence effect. However, no phosphorescence was observed in the isotropic phase. Thus, not only aggregation but also regularity of molecular aggregates is necessary for the observed crystallization-induced phosphorescence effect.