May 16th, 2020, Xiaoyan Tang, Yuchong Yang and Bo Qin accomplished their defenses of the requirement for the degree of PhD. Xiaoyan Tang’s, Yuchong Yang’s and Bo Qin’s research focus on supramolecular catalysis, antibacterial supramolecular materials and quadruple hydrogen bond-based supramolecular polymers, respectively. Members of the defense committee showed great interest on their excellent works and fully recognized their works.

　Affected by the COVID-19 epidemic, the defense meeting was hold both at Room 310, Hetian Building, Tsinghua University and online. All members of the defense committee as well as Dr. Jiang-Fei Xu, except Prof. Xi Zhang, attended the defense meeting at Room 310; Prof. Xi Zhang attended the defense meeting online. Bo Qin defended at Room 310, whereas Xiaoyan Tang and Yuchong Yang accomplished their defenses online. Congratulations to Xiaoyan Tang, Yuchong Yang and Bo Qin!