240. Pingru Su, Biaowen Wei, Chenxing Guo, Yaqi Hu, Runxu Tang, Shunran Zhang, Chuanxin He, Jing Lin, Xiujun Yu, Zhi Chen, Haiyang Li, Heng Wang,* Xiaopeng Li. Metallo-supramolecular hexagonal wreath with four switchable states based on a pH-responsive tridentate ligand. J. Am. Chem. Soc., 2023, 145, 3131–3145.