Effect of Oxygen on the Fluorescence of Sol-Gel with Ruthenium Complexes
JIANG Ya-qi1, ZHONG Zhen-ming1, CHEN Xi1*, WANG Xiao-ru1，WONG Kwokyin2
1.The Key Laboratory of Analytical Sciences of MOE and Department of Chemistry, Xiamen University, Xiamen 361005, China 2. Department of Applied Biology and Chemical Technology, the Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China
Abstract：Different Ru complexes were used in an organically modified sol-gel (ormosil) sensing film to character their quenching behaviors to oxygen. The sensing film with tris-(4,7-diphenyl-1,10-phenanthroline) ruthenium(Ⅱ) [Ru(dpp)2+3] as an indicator was selected because of its characteristics with high quenching efficiency, fast response time, high luminescence intensity and long-term stability. The quenching behavior of the sensing film greatly depended on the content of dimethyldimethoxysilane (DiMe-DMOS) in ormosil because DiMe-DMOS changed the polarity of sensing film. A home-made fluorescence quenching system was set up for oxygen determination based on a blue LED (λmax=460 nm) as an exciting light source. The response time was 30 s from saturated nitrogen to oxygen in water, and 90 s from saturated oxygen to nitrogen.
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