2021 Fiscal Year Final Research Report

Development of technologies for preparing metastable states of soft crystals and elucidation of their phase transition phenomena

Planned Research

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Project Area	Soft Crystals: Science and Photofunctions of Easy-Responsive Systems with Felxibility and Higher-Ordering
Project/Area Number	17H06375
Research Category	Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Allocation Type	Single-year Grants
Review Section	Science and Engineering
Research Institution	The University of Tokyo
Principal Investigator	Ishii Kazuyuki 東京大学, 生産技術研究所, 教授 (20282022)
Co-Investigator(Kenkyū-buntansha)	宮武智弘龍谷大学, 先端理工学部, 教授 (10330028) 高江恭平東京大学, 生産技術研究所, 特任講師 (30739321) 篠崎一英横浜市立大学, 理学部, 教授 (40226139) 恩田健九州大学, 理学研究院, 教授 (60272712) 池田浩大阪府立大学, 工学(系)研究科(研究院), 教授 (30211717)
Project Period (FY)	2017-06-30 – 2022-03-31
Keywords	準安定状態 / ポルフィリン / 機械的回転 / 相転移 / 分光
Outline of Final Research Achievements	In the case of soft crystals, It is extremely important to develop the technologies for preparing metastable states of soft crystals and elucidate their phase transition phenomena. In this research project, we investigated (1) the application of super-resolution microscopy to soft crystal phenomena, (2) development of the technologies for preparing metastable states of aggregates or oriented thin films before crystallization, (3) molecular modeling-based theoretical calculations of phase transition phenomenon by, and (4) functionalizations of soft crystal phenomena using soft materials. In particular, in (2), we found that the chirality of the thin films prepared by concentrating phthalocyanine solutions depended on the rotational direction of a rotary evaporator. The chiral thin films showed thermochromic and mechanochromic properties, and their transition behaviors from the metastable state to the stable state were clarified.
Free Research Field	錯体化学・光化学・スピン化学
Academic Significance and Societal Importance of the Research Achievements	“研究成果の概要”における①に相当するソフトクリスタル現象の超解像顕微鏡観察では、生細胞研究に用いられてきた技術を分子性結晶に適用しており、今後の様々な展開が期待できる。②は、メカノクロミズムの速度論的・熱力学的考察に有用であるだけでなく、新たなキラル物質合成法としての発展も期待できる。③の相転移理論計算では、理論物理と分子性結晶化学を繋いでおり、学術的意義が高いと言える。④では液晶分子と色素分子を複合化し、分子相転移を活用した新規遮熱材の原理も提案していることから、社会的意義も高いと考えられる。