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# Chair

Professor Akimitsu Narita

日本沖繩科學技術大學院大學

Akimitsu Narita在日本橫濱出生長大。他在東京大學獲得化學學士和碩士學位，師從Eiichi Nakamura教授。隨后，他加入了德國美因茨馬克斯-普朗克聚合物研究所（MPIP）Klaus Müllen教授的研究小組，并于2014年獲得美因茨約翰內斯-古騰堡大學化學博士學位。同年，他成為MPIP合成化學部的項目負責人。2018年，他作為助理教授（兼職）加入OIST，領導有機和碳納米材料部門。自2020年起，他在OIST擔任全職助理教授。

# Speaker 1

Molecular Carbons with Different Shapes and Sizes

具有不同形狀和大小的分子碳

Professor Chunyan Chi

新加坡國立大學

Carbon-based nanostructures have shown revolutionary influence in the area of chemistry, physics and materials science. Recent efforts have been focused on novel topological structures of sp2-carbons such as carbon nanohoops, nanobelts, molecular cages, and open-shell nanographenes, which provoked new chemistry and materials. However, synthesis of this kind of molecules is extremely challenging mainly due to strain or intrinsic high reactivity. Another issue is that most of these carbon nanostructures have a localized aromatic character; that means, the π-electrons are not globally delocalized along the backbone, which limits their optical and electronic properties and applications. Herein, the synthesis of a series of novel pi-structure with different shapes will be introduced, and their physical properties, aromaticity and diradical character will be discussed.

# Speaker 2

Stabilization of Acenes and Azaacenes

并苯和氮雜并苯的穩定化

Professor Uwe Bunz

德國海德堡大學

In the past we have developed new synthetic apporaches to azapentacenes and azahexacenes, stabilized by TIPS-ethynyl groups. Now our focus has shifted into stabilizing very large (heptacene and beyond) acenes and azaacenes. This can be done for azaheptacenes and nonacenes by introducing four to six TIPS-ethynl groups on every other ring and reasonably stable species were isolated. To go beyond the nonacene limit, alternative methods of stabilization are needed. We converted pentacene-5,7,12,14-tetraone in two steps into a doubly bridged (2,2'''-substituted 1,1':4',1'':4'',1'''-quaterphenyl) pentacene, which is ca. 65 times more stable than TIPS-pen.

# Speaker 3

Professor Tomoyuki Ikai

日本國立名古屋大學

Recent advancements in synthetic methodologies have greatly expanded the range of molecules and polymers accessible for chemists, increasing the potential for significant breakthroughs in materials science. Polymers with a molecular-level ladder structure, in which cyclic repeating units are interconnected by two or more chemical bonds, are referred to as ladder polymers.1 Due to their rigid backbone structures, ladder polymers display superior mechanical properties and thermal stability compared to conventional linear polymers linked by single chemical bonds. The severely restricted conformational freedom is also a defining characteristic of ladder polymers, offering a high degree of structural designability that allows precise control of the secondary structure in synthetic polymers. However, the synthesis of well-defined ladder polymers without branching or imperfect ladder formation remains a significant challenge for organic and polymer chemists. We have previously developed an efficient approach to ladder formation2 by modifying the acid-promoted alkyne benzannulations developed by Swager et al.3,4 This has led to the successful synthesis of ladder polymers with well-defined helical2,4–7 and coplanar2 geometries, free from detectable levels of structural defects, based on the appropriate design of chiral and achiral monomeric units. Recently, we designed and synthesized a series of helical ladders by incorporating pi-extended achiral spacer units as a third comonomer component, alongside the chiral and achiral units.8 This design allowed the modulation of the secondary structures with different helical handedness (P or M) and geometry (extended ribbon-like or loose coil helix) by replacing the achiral spacer units in the main chain while retaining the chiral monomer units. This talk will detail the design and synthesis of such chiral ladder architectures, highlighting their chiral functions, particularly with respect to circularly polarized luminescence and chiral recognition.