The 218th MANA & the 97th ICYS Joint Seminar
Dr. Hong-tao Sun & Dr. Hisanori Ueki
| Date | September 2, Friday |
| Time | 15:30-16:30 |
| Place | Seminar room #811, 8F, Central Bldg., SENGEN Site, NIMS |
Download PDF file for seminar info.
15:30-16:00
Functional Photonic Materials Activated by Subvalent Bismuth
Bismuth is one of the most thoroughly investigated main group elements, which exists in the valence state of +3 in a wide array of functional materials such as magnets, superconductors, thermoelectric and spintronic materials. Recent work clearly revealed that by facile changing the valence state of Bi from +3 to subvalent state, peculiar near infrared photophysical behaviors could be observed in many classes of novel materials, which may find broad applications in future optical interconnects to address the problems of high power consumption and low bandwidths of electrical interconnects. In this seminar, I will talk about our recent advance on the synthesis as well as functional applications of materials containing a broad range of subvalent Bi units.
Speaker
Dr. Hong-tao Sun, ICYS-Sengen Researcher, NIMS
Chair
Dr. Yoshio Sakka, Materials Processing Unit, NIMS
16:00-16:30
Novel Shape-Persistent Nano-Sized Triangle-Shaped Macrocycles Comprising Three 2,2’-Bipyridine Units
New materials/new molecules are always demanded since possibly they can change the world. One of the typical ways to prepare them is derivatization of certain materials/molecules. On the other hand, a breakthrough often happens as a result of finding/design and synthesis of novel and original compounds. The former case is relatively easy once methods for the derivatization are established, but the latter case requires strong frontier spirits from the beginning to the end. Due to the unique character, considerable attentions have recently been devoted to shape-persistent maclocycles for their potential applications in supramolecular and material chemistry, including molecular recognitions, liquid crystals, vesicles, gels, two-dimensional molecular networks, extended tubular channels, organic porous solids, optoelectronic devices and so on. On the other hand, 2,2’-bipyridine units have been extensively used as a metal chelating ligand, and that character allow us to utilize molecules comprising 2,2’-bipyridine for specific purposes such as various sensors, catalysts, and ligand for MOFs. Even without the metal complexation, molecules containing 2,2’-bipyridine unit are proved to be quite useful materials (proton sensor, non-linier optical chromophore, hole blocking or electron transport for OLED, and so on). Here I present the trial to prepare a novel shape-persistent nano-sized triangle-shaped macrocycles comprising three 2,2’-bipyridine units. In this presentation, I will describe mainly how I design and synthesize the molecule. The key step in the synthesis is the cyclization step. Fixing the geometry of the starting compounds with the aid of metal chelations at the 2,2’-bipyridine units would realize the cyclization. As is shown in other shape-persistent macrocycles, this molecule is all π-conjugated and has very rigid triangle shape. Therefore, this newly prepared molecules should have very nice future prospects as new materials and/or new functional molecules.
Speaker
Dr. Hisanori Ueki, ICYS-MANA Researcher, NIMS
Chair
Dr. Kentaro Tashiro, MANA Scientist, NIMS