Talk given by Prof. Hiroshi Nishihara Department of Chemistry School of Science University of Tokyo Japan Abstract: One of the final goals of the research on molecular electronics is to control electron conduction in molecular wires and networks at will by combining appropriate molecular units. Here I present interfacial coordination reactions to synthesize electro-functional nanowires and nanosheets. A facile bottom-up method has been developed to fabricate molecular wires of bis(terpyridine)metal oligomers on the gold surface based on the Au-S bond formation or on hydrogen-terminated silicon surface based on the Si-C bond formation.[1,2] The electron conduction properties of internal molecular segments as well as the resistivity at the electrode-molecular wire junction and the terminal hetero-redox molecular connection were quantitatively analyzed to evaluate the total performance of the molecular wires. Monolayer nanosheet materials have attracted much attention because of their unique physical and chemical properties, which derive from their two-dimensional (2D) nature. We have synthesized π-conjugated nanosheets comprising metal ions and organic Pi-ligands by the interfacial coordination reactions.[3,4] For example, a liquid−liquid interfacial reaction of nickel(II) acetate in an aqueous phase with benzenehexathiol in an organic phase produced semiconducting sheets containing bis(dithiolato)nickel moieties with one micrometer thickness. A single-layer nanosheet with 0.6 nm thickness was successfully synthesized using a gas−liquid interfacial reaction. Modulation of the oxidation state and the electronic conductivity of the coordination nanosheet was achieved using redox reactions. References [1] R. Sakamoto, S. Katagiri, H. Maeda, H.,Nishihara, “Bis(terpyridine) metal complex wires: Excellent long-range electron transfer ability and controllable intrawire redox conduction on silicon electrode,” Coord. Chem. Rev. 2013, 257, 1493-1506. [2] R. Sakamoto, K.-H. Wu, R. Matsuoka, H. Maeda, H. Nishihara, “Pi-Conjugated bis(terpyridine)metal complex molecular wires,” Chem Soc. Rev. 2015, 44, 7698-7714. [3] R. Sakamoto, K. Takada, X. Sun, T. Pal, T. Tsukamoto, E. J. H. Phua, A. Rapakousiou, K. Hoshiko, H. Nishihara, “The coordination nanosheet (CONASH),” Coord. Chem. Rev. 2016, doi: 10.1016/j.ccr.2015.12.001. [4] H. Maeda, R. Sakamoto, H. Nishihara, “Coordination Programming of Two-​dimensional Metal Complex Frameworks,” Langmuir 2016, 32, 2527-2840 (Feature Article). 

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Prof. Hiroshi Nishihara

University of Tokyo
http://www.chem.s.u-tokyo.ac.jp/~inorg/new_en/nisihara.html

Organizer
Prof. Mario Ruben
Institut für Nanotechnologie
KIT
Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen
Mail: mario ruben ∂does-not-exist.kit edu
https://www.int.kit.edu/1938_mario.ruben.php

Targetgroup
Interested / Everyone