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Accueil > Séminaires > Année 2018 > Séminaire de Xinrui Miao (30 oct 2018)

Séminaire de Xinrui Miao (30 oct 2018)

Department of Materials Science and Engineering, South China University of Technology, Guangzhou, China

par Martrenchard-Barra Séverine - 4 octobre (modifié le 9 octobre)

Cooperation and competition mechanism of halogen and hydrogen bonding in 2D self-assembled polymorph by STM

Hydrogen bond and halogen bond are two kinds of key intermolecular interactions because of their strength, directionality, and high selectivity. The competition mechanism between the formation of hydrogen bond and halogen bond in molecular self-assembly still remains obscure and predicting structures involving both hydrogen bond and halogen bond is still challenging. Scanning tunneling microscopy (STM) allows the atomic scale characterization of two-dimensional (2D) molecular packing at room temperature and at the solid/liquid interface, which is essential to assess the intermolecular interactions. We have designed and synthesized several series of organic molecules with halogen atoms and other groups (such as C=O, –COO–, –COOH, S) systematically. Combing STM with density functional theory (DFT), we found that the competition and cooperation of halogen bond and hydrogen bond could induce the controllable polymorphic nanostructures by adjusting the solvent and solution concentration at the liquid-solid interface. In this talk, I will show the effects of the solvent and concentration on halogen- and hydrogen-bonded nanostructures for the phenanthrene, thienophenanthrene, and fluorenone derivatives. I will also show the fabrication of chiral patterns by halogen bonding. These results will provide new insights to fabricate complex polymorphic halogen-bonded nanostructures and understand the cooperation and competition mechanism of halogen and hydrogen bonds.

Séminaire de Xinrui Miao - 106.6 ko

30 oct 2018