Lyotropic Chromonic Mesophases of Chiral Organopalladium(II) Complexes for Amplified Circularly Polarized Phosphorescence

Author:

Zhou Ning1,Xie Mo2,Zheng Ceyuan1,An Jiabo13,Zou Chao13,Lu Wei1ORCID

Affiliation:

1. Department of Chemistry Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China

2. College of Chemistry and Materials Science Jinan University Guangzhou Guangdong 510632 China

3. Functional Coordination Material Group – Frontier Research Center Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

Abstract

AbstractHerein, it is reported that lyotropic liquid crystals that transfer carbon‐centered chirality to helical chirality and subsequently to macroscopic chirality in the mesophases. This process is accompanied by remarkable amplification of both emission quantum yield and dissymmetry factor of the circularly polarized luminescence (CPL). Cationic tridentate cyclometalated Pd(II) complexes, once functionalized with chiral hydrogen‐bonding motifs of amide, aggregated into head‐to‐tail dimers at low concentrations in acetonitrile and further self‐organized into chiral lyotropic chromonic mesophases upon concentrated to 50 wt.%. At 25 °C, the chiral chromonics display metal–metal‐to‐ligand charge‐transfer (MMLCT) phosphorescence at an emission maximum of 677 nm with quantum yields up to 38% and lifetimes up to 0.50 µs. Notably, the dissymmetry factors ranged from 0.10 to 0.76, varying with the sample thickness in the range of 200–15 µm. Comparison studies and theoretical calculations reveal that the hydrogen‐bonding amide group is pivotal for the formation of the staggered configuration in the helical superstructures. Additionally, the carbon‐centered chirality of the amide dictate the handedness of the helices and consequently influenced the properties of CPL.

Funder

National Natural Science Foundation of China

Basic and Applied Basic Research Foundation of Guangdong Province

Publisher

Wiley

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