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Fluorescence Spectral Study on the Rhodamine B-I_3^- Association Nanoparticle System and Its Analytical Applications
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作者 康彩艳 奚旦立 +1 位作者 蒋治良 高阳俊 《Journal of Donghua University(English Edition)》 EI CAS 2006年第4期48-51,共4页
In acid medium, rhodamine B(RhB), rhodamine S(RhS), rhodamine 6G(RhG) and butyl rhodamine B(b-RhB) have a fluorescence peak at 580, 549, 553 and 580nm, respectively. BrO^-3 oxidizes excess I^- into I^-3 Rhodam... In acid medium, rhodamine B(RhB), rhodamine S(RhS), rhodamine 6G(RhG) and butyl rhodamine B(b-RhB) have a fluorescence peak at 580, 549, 553 and 580nm, respectively. BrO^-3 oxidizes excess I^- into I^-3 Rhodamine dyes combine I^-3 to form ion association nanoparticles, resulting in fluorescence quenching at 580, 549, 553 and 580 rim, respectively. The fluorescence quenching intensity is proportional to the concentration of BrO^-3 in the range of 0.020 4 - 0.710 μg/mL for RhB, 0.025 - 0. 512μg/mL for RhS, 0.025 - 0.260 μg/mL for RhG, 0.025 - 1.28μg/mL for b-RhB, respectively. In the four systems, RhB system has good stability and high sensitivity. Thus, a simple, sensitive fluorescence method was proposed for the determination of BrO^-3 in commercial bread additives and flours, with satisfactory results. The results of the fluorescence spectra and scan electron microscopy show that the formation of about 60 ran (RhB - I^-3) n association nanoparticles and the interface between the nanoparticles and solution are main factors that cause the fluorescence quenching. 展开更多
关键词 rhodamine dyes FLUORESCENCE rhodamine B-I^-3 association nanoparticle bromate.
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A new Cu^(2+)-induced color reaction of a rhodamine derivative N-(3-carboxy)acryloyl rhodamine B hydrazide 被引量:3
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作者 SUN ChengDong CHEN JianMing +3 位作者 MA HuiMin LIU Yang ZHANG JingHua LIU QingJun 《Science China Chemistry》 SCIE EI CAS 2011年第7期1101-1108,共8页
A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible n... A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible non-fluorescent absorption upon coordination to Cu2+,which is a rather unusual phenomenon for rhodamine B derivatives.Stoichiometric measurements using the Job's method and the molar ratio method reveal that one CARB molecule combines two Cu2+ ions,and the two Cu2+ ions play different roles:one opens the spirocyclic structure and the other quenches the fluorescence of the xanthene moiety.This reaction mechanism is supported by a comparative study on the model compound N-acryloyl rhodamine B hydrazide as well as by the density functional theory calculations.Furthermore,the absorption response of CARB is highly selective for Cu2+ over other common ions,which implies that CARB may be used as a colorimetric probe for the rapid visual detection of Cu2+. 展开更多
关键词 N-(3-carboxy)acryloyl rhodamine B hydrazide reaction mechanism colorimetric probe visual detection COPPER N-acryloyl rhodamine B hydrazide
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