Synthesis and Self-assembly Behaviors of POSS-based Host-Guest complex

• Main Authors: Jao, Meng-Hsuan, 饒孟璇
• Other Authors: Wang, Chien-Lung
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/p4bz3u

碩士 === 國立交通大學 === 應用化學系碩博士班 === 105 === POSS is considered to be the smallest silicon oxide nanoparticles (NPs) and the molecular shape is close to a cube (side length ~ 0.5-0.7 nm). Attaching conjugated arms to the eight vertices of a POSS core resulting in a 3D conjugated giant molecule. Our previous studies have showed that through conformational isomerization, POSS derivatives can adopt a rod-like conformation, which contain two empty cavities above and below the POSS core. The diagonal distance of the cavity is about 0.8 nm, making the conjugated POSS a suitable building-block in host-guest chemistry. We wondered whether or not conjugated POSS can properly work as a host. To look into this issue, POSS-derivative with electron-rich pyrene unit attached to the eight vertices of POSS core was synthesized to be a host. Electron-deficient naphthalene diimide derivatives such as hex-NDI and Di-NDI were synthesized to be guest. In this work, we will try to perfect the supramolecular structure of the POSS-py/hex-NDI and POSS-py/Di-NDI complex. The solid-state characterization including DSC, X-ray diffraction showed that hex-NDI molecules can be trapped within the POSS cavities at the molar ratio of POSS-py:hex-NDI = 1:4, and formed a new smectic liquid crystal phase; on the other hand, POSS/Di-NDI will form an ordered structure in molar ration of 1:2. In solution phase, the results provide that adding of hex-NDI will help to contract the arms of POSS-py, forming a more specific shape of the cylindrical particles.