Aggregation and chirality

Haoke Zhang; Ryan T. K. Kwok; Jacky W. Y. Lam; Ben Zhong Tang

doi:10.1117/12.2324632

14 September 2018 Aggregation and chirality

Haoke Zhang, Ryan T. K. Kwok, Jacky W. Y. Lam, Ben Zhong Tang

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Proceedings Volume 10735, Liquid Crystals XXII; 107350H (2018) https://doi.org/10.1117/12.2324632
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

Debate on the origin of chirality has lasted for several centuries. Lots of theories in different fields have been propounded to illustrate the possible sources. However, there were no convincing proofs could be provided. In this work, through constructing the relationship between aggregation and chirality, a significant insight was brought to explain how the chirality was generated from the achiral system. Besides, aggregation-induced circular dichroism (AICD) effect was discovered in some AIEgens decorated with amino acid or sugars and aggregation-annihilated circular dichroism (AACD) effect was reported in axially chiral systems. In AICD systems, it was proved that the chirality could transfer from chiral centers to AIEgens in the aggregate state but not solution. Meanwhile, it was concluded that the right-handed helical structures corresponded to a negative Cotton effect and vice versa. For the AACD effect, further studies suggested that the annihilation was caused by the change of twist angle within the process of aggregation.

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Haoke Zhang, Ryan T. K. Kwok, Jacky W. Y. Lam, and Ben Zhong Tang "Aggregation and chirality", Proc. SPIE 10735, Liquid Crystals XXII, 107350H (14 September 2018); https://doi.org/10.1117/12.2324632

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