Preparation of Novel Fluoroalkyl End-Capped Trimethoxyvinylsilane Oligomeric Nanoparticle-Encapsulated Binaphthol: Encapsulated Binaphthol Remaining Thermally Stable Even at 800 °C

Abstract

Abstract Novel cross-linked fluoroalkyl end-capped trimethoxyvinylsilane oligomeric nanoparticles [RF–(VM-SiO2)n–RF]-encapsulated 1,1′-bi(2-naphthol) (BINOL) were prepared by the hydrolysis of fluoroalkyl end-capped trimethoxyvinylsilane oligomer in the presence of BINOL under alkaline conditions. RF–(VM-SiO2)n–RF-encapsulated BINOL nanocomposite thus obtained afforded no weight loss corresponding to the presence of BINOL in the composite at 800 °C. Interestingly, RF–(VM-SiO2)n–RF/BINOL nanocomposite did not show absorption peaks before calcination however this nanocomposite was found to exhibit similar absorption and fluorescence peaks to those of the parent BINOL after calcination at 800 °C. More interestingly, RF–(VM-SiO2)n–RF/BINOL nanocomposite after calcination exhibited a releasing characteristic into methanol although before calcination this nanocomposite showed no such characteristic at all. In particular, FT-IR spectra of the released molecules showed typical bands related to both the parent BINOL and silica gel, indicating that the released guest molecules should be thermally stable even at 800 °C through the architecture of rigid BINOL-containing silica gel matrices.