2010 Fiscal Year Final Research Report
Preparation of polysilsesquioxanes with hierarchical structures and their functionalization
| Project/Area Number |
21750127
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Polymer chemistry
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| Research Institution | Kagoshima University |
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Principal Investigator |
KANEKO Yoshiro Kagoshima University, 理工学研究科(工学系), 准教授 (80404474)
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| Project Period (FY) |
2009 – 2010
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| Keywords | ゾル-ゲル反応 / ポリシルセスキオキサン / オルガノアルコキシシラン / ラダー構造 / ヘキサゴナル積層構造 / ハイブリッド / キラル / コンフォメーション |
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| Research Abstract |
In this study, we prepared ladder-like polysilsesquioxanes (PSQs) containing chiral and ammonium chloride groups as side-chains, forming chiral conformations and hexagonal stacking structures. This was achieved by sol-gel copolycondensation of chiral organotriethoxysilane and 3-aminopropyltriethoxysilane in a mixed solvent of aqueous hydrochloric acid and methanol. The structures of the resulting products were characterized by 1H NMR, IR, ^29Si NMR, static light scattering (SLS), X-ray diffraction (XRD), vibrational circular dichroism (VCD) measurements. In addition, we investigated the formation of chiral aggregates of anionic porphyrin such as tetraphenylporphine tetrasulfonic acid (TPPS) using the resulting PSQs. The electronic circular dichroism (ECD) and UV-Vis spectra of aqueous mixtures of TPPS/PSQs indicated the formation of chiral H-aggregates of TPPS along the ammonium groups as side-chains of the PSQs.
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