Creation of Functional Materials Based on the Precise Control of Sound-Induced Molecular Aggregation

作为一种用于精确控制聚集体的物理性质和功能的前瞻性技术，刺激响应型超分子组装已被广泛研究。我们团队开发了一种新的方法，通过短暂的超声波辐射，快速凝胶化稳定的有机流体，包括双核Pd络合物ANTI-1。这一现象是第一个瞬间和远程控制溶胶-凝胶转变的例子，并引起了人们对基于凝胶现象的功能络合物的开发的兴趣。合成了具有各种取代基、金属、间隔基的新型金属络合物，并对其性质进行了研究。通过核磁共振、紫外-可见光谱等光谱方法以及扫描电子显微镜和原子力显微镜对凝胶形貌的直接观察，对新型凝胶的形成机理有了基本的认识。此外，我们还建立了“聚合聚合”的新概念。基于这一概念，我们成功地展示了一种新型的聚集模式--活聚集。

Stimuli-responsive supramolecular assembly has been studied extensively as a forward-looking technology for the precise control of the physical properties and functions of aggregates. Our group developed a new methodology for the instant gelation of stable organic fluids including dinuclear Pd complex, anti-1, by brief irradiation with ultrasound. This phenomenon is the first example of the instant and remote control of sol-gel transition, and attracts our interest in the development of functional complexes based on gelation phenomena. New metal complexes, that have various kind of substituents, metals, spacers, have been synthesized, and the properties of these complexes were examined. A basic knowledge on the mechanism of the new-fashioned gelation was obtained by carrying out spectroscopic methods such as NMR, UV-vis spectra, and direct observation of morphology by scanning electron microscope and atomic force microscopy. In addition, we established a new concept of "aggregation polymerization." Based on this concept we succeeded to demonstrate a new type of aggregation mode, living aggregation.