|Wednesday, July 20|
Chemically modified gold superatoms as nanoscale artificial elements
* Tatsuya Tsukuda, The University of Tokyo, Japan
Gold clusters, consisting of a few to a hundred gold atoms, have attracted growing attention as building units of novel functional materials because they exhibit unique physicochemical properties due to their discrete electronic structures and non-fcc atomic packing structures. Recent progress in atomically precise synthesis, X-ray crystallography and theoretical calculations  has revealed that the ligand-protected Au clusters can be viewed as “chemically modified Au superatoms" owing to the atom-like electronic shell structures. For example, the magic stability of the icosahedral M@Au12 core is associated with a closed electron configuration (1S)2(1P)6, similarly to that of noble gases. A unique feature of the superatoms compared to the conventional atoms is that their properties can be controlled by a variety of factors such as the number of constituent atoms, composition, shape, and surface modification [2, 3]. Our research goal is to systematize the superatoms as nano-scale artificial elements in the form of a periodic table. In this talk, I will discuss the correlation between the structures and properties of these superatoms [4, 5] and introduce chemical transformations for the synthesis of higher-order structures such as pseudo-molecules of superatoms (superatomic molecules) [6, 7]. References  Omoda, T.; Takano, S.; Tsukuda, T. Small 2021, 17, 2001439.  Hirai, H.; Ito, S.; Takano, S.; Koyasu, K.; Tsukuda, T. Chem. Sci. 2020, 11, 12233–12248.  Takano, S.; Tsukuda, T. J. Am. Chem. Soc. 2021, 143, 1683–1698.  Takano, S.; Hirai, H.; Nakashima, N.; Iwasa, T.; Taketsugu, T.; Tsukuda, T. J. Am. Chem. Soc. 2021, 143, 10560–10564.  Hasegawa, S.; Takano, S.; Harano, K.; Tsukuda, T. JACS Au 2021, 1, 660–668.  Takano, S.; Hasegawa, S.; Suyama, M.; Tsukuda, T. Acc. Chem. Res. 2018, 51, 3074–3083.  Ito, E.; Takano, S.; Nakamura, T.; Tsukuda, T. Angew. Chem., Int. Ed. 2021, 60, 645–649.