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Distinguished Lecture Series| No. 299:The Supramolecular Structure in the Design of Organic Optoelectronic Materials

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Lecture Topic: 

The Supramolecular Structure in the Design of Organic Optoelectronic Materials

Lecturer:

Zhao Dahui

Time: 

December 23, 2019 (Monday) 9:00-11:00

Place:

Room 426, Qiushi Building, Zhongguancun Campus

Organizer:

Graduate School, School of Materials

Registration:

Log-in to WeChat enterprise of Beijing Institute of Technology— 第二课堂(The Second Lecture)— Choose No.299 in the Lecture Registration

 

Lecture Information

The supramolecular structures of organic π-conjugated molecules are of great importance to organic electronics and other related fields, since the functional materials' properties are sensitively influenced by the intermolecular interactions in both crystalline and amorphous states. Therefore, the ability to control and fine tune the supramolecular structures of conjugated molecules is highly desirable in designing organic functional materials. Nonetheless, it is still a great challenge to precisely predict and construct with control the supramolecular structures of organic molecules, because they are governed by a range of weak yet collectively influential noncovalent interactions. Thus, supramolecular systems showing competing assembling paths provide valuable platforms to learn to maneuver the supramolecular architectures.

 

The presentation focuses on the self-aggregation behaviors of a series of pi-conjugated molecules showing competing assembly paths leading to different aggregate structures, which can be conveniently differentiated with electronic spectroscopy. Interestingly, by virtue of the energetic disparity among different paths, different aggregate products are manifested sequentially and selectively under by varied conditions (e.g., solvent polarity, temperature, concentration changes, etc.). After carefully examining the correlation between the molecular structure and corresponding supramolecular architectures, we were able to unravel the underlying structural basis that determine the assembly energetics. The results suggest that both the electronic features and the steric geometry of the molecules are important factors governing the supramolecular architectures and the energetics thereof. With such information, we are able to alter the assembly path and control the aggregate structure, by subtly modifying the molecular structures. These supramolecular chemistry studies have helped us better understanding the general behaviors of pertinent functional molecules and designing new materials more rationally.

 

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