2, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States
Chemists are often regarded as “architects”, who are capable of building up complex molecular structures in the ultrasmall world. However, compared with organic chemistry, nanochemistry dealing with nanoparticles in the size range from 1 to 100 nm is less precise in terms of synthesis, composition, and structure. Such an imprecise nature of nanochemistry has impeded rational control and in-depth understanding of structures and properties of nanomaterials.
Recently, thiolate-protected gold nanoclusters have emerged as a paradigm of atomically precise nanomaterials1. In this poster, I will first discuss how to synthesize atomically precise gold nanoclusters containing ~10 to ~1000 gold atoms (i.e. 1 to 3 nm), as well as their total structure determination by single-crystal X-ray diffraction. Then, I will show that how the precise nature of these nanomaterials allows us to discover, decipher and understand many intriguing nanoscale phenomena, including the transformation chemistry at the nanoscale2, periodicities in nanoclusters3, a supermolecular origin of “magic sizes”4, and the emergence of hierarchical structural complexity in the nanoparticle system5.
 R. Jin, C. Zeng, M. Zhou, Y. Chen, Chem. Rev.116, 10346-10413 (2016).
 C. Zeng, C. Liu, Y. Pei, R. Jin, ACS Nano 7, 6138-6145 (2013).
 C. Zeng, Y. Chen, K. Iida, K. Nobusada, K. Kirschbaum, K. J. Lambright, R. Jin, J. Am. Chem. Soc. 138, 3950-3953 (2016).
 C. Zeng, Y. Chen, C. Liu, K. Nobusada, N. L. Rosi, R. Jin, Sci. Adv. 1, e1500425 (2015).
 C. Zeng, Y. Chen, K. Kirschbaum, K. J. Lambright, R. Jin, Science 354, 1580-1584 (2016).