Crystal Engineering Using Folding Building blocks and Stimuli-responsive Organic Crystals

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410084
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Chiba University
• Principal Investigator: KOHMOTO SHIGEO 千葉大学, 工学(系)研究科(研究院), 教授 (90195686)
• Co-Investigator(Renkei-kenkyūsha): KISHIKAWA KEIKI 千葉大学, 大学院工学研究科, 教授 (40241939)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 有機結晶 / 結晶配列制御 / 共結晶 / 水素結合 / フォルダマー / 蛍光 / 刺激応答性発光

Outline of Final Research Achievements

In order to construct folding structures in organic crystals via supramolecular way, U-shaped and S-shaped aromatic ureas possessing carboxy groups at both ends of the molecules were developed. Various cocrystals with hydrogen-bonding acceptor molecules were prepared and their crystal structures were examined by single crystal X-ray analysis. A Unique hydrogen bonding network of melamine was created in the cocrystal with the S-shaped molecule. Folded molecules were applied to the creation of stimuli-responsive organic crystals. Grinding of the salts or solvates of the folded molecules caused changes of their fluorescence color. Exposure of the ground crystals resulted in the re-generation of the original color of fluorescence. The relation between the crystal structures and the responsiveness toward grinding were investigated by the inspection of their crystal structures.

Free Research Field

化学