共价嫁接钌(Ⅱ)配合物KIT-6介孔分子筛的制备及氧气传感性能

Preparation and Oxygen Sensing Properties of Mesoporous KIT-6 with a Covalently Grafted Ruthenium(Ⅱ) Complex

将同时具有可水解烷氧基团和能与金属离子配位的二亚胺基团的有机分子先与Ru(II)配位,形成功能化Ru(II)配合物分子,再将该Ru(II)配合物以P123作为结构导向剂,在弱酸催化作用下,与正硅酸乙酯发生水解缩聚反应,成功制备出共价嫁接Ru(II)二亚胺分子片断的KIT-6介孔分子筛。用XRD,红外光谱,寿命衰减曲线和发光强度猝灭Stern-Volmer曲线对样品进行表征。实验结果表明,所制备的有机/无机杂化传感材料对氧气具有较好的传感灵敏度、可逆的氧传感信号和较高的光化学稳定性。

Novel oxygen sensing materials consisted of Ru(II) complex covalently-grafted functionalized mesoporous molecular sieves KIT-6 were prepared by co-condensation of tetraethoxysilane(TEOS) with the functionalized Ru(II) complex [Ru(bath)2Phen-Si]2+ in the presence of Pluronic P123 surfactant as template. The obtained oxygen sensing materials were characterized by Fourier transform infrared(FT-IR), XRD, excited state decay curve and luminescence intensity quenching Stern-Volmer plot. The functionalized mesoporous sensing materials are highly sensitive to the concentration of O_2 in N2 atmosphere. The results show that the covalently-grafted sample represent nice reversible signals and high photochemical stability since these Ru(II) molecules are strongly covalently-grafted to the Si-O network via the CH2-Si bonds.