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Effects of the interaction between Na2Wo4‐6‐benzylaminopurine anionic chelate and rhodamine 6G on the resonance Rayleigh scattering and fluorescence spectra and their analytical applications
Authors:Xiao‐yan Li  Zhou Shang  He Wei  Ji‐dong Yang
Institution:1. School of Chemistry and Chemical Engineering, Southwest University, , Chongqing Beibei, 400715 China;2. School of Chemistry and Chemical Engineering, Yangtze Normal University, , Chongqing Fuling, 408100 China;3. School of Chemistry and Enviromental Engineering, Chongqing Three Gorges University, , Chongqing Wanzhou, 404000 China
Abstract:In pH 4.99‐6.06 Britton‐Robinson (BR) buffer medium, 6‐benzylaminopurine (6‐BA) reacted with Na2WO4 to form 1:1 anionic chelate (6‐BA·WO4)2‐, which further reacted with rhodamine 6G to form ternary ion complexes at room temperature. This resulted in a significant enhancement of resonance Rayleigh scattering (RRS) with a maximum RRS wavelength of 316 nm. Meanwhile, the fluorescence of the solution was quenched and excitation (λex) and emission (λem) wavelengths of the fluorescence were 290 and 559 nm, respectively. Intensities of RRS enhancing (ΔIRRS) and fluorescence quenching (ΔIF) were directly proportional to concentrations of 6‐BA. As a result, RRS and fluorescence quenching for determination of trace amounts of 6‐BA were developed. Under optimal conditions, linear ranges and detection limits of the two methods were 0.05‐15.00 µg/mL and 8.2 ng/mL (RRS), 0.50‐15.00 µg/mL and 17.0 ng/mL, respectively. It was found that the RRS method was superior to fluorescence quenching. The influence of these methods were investigated and results showed that RRS had good selectivity. RRS was applied to determine 6‐BA in vegetable samples with satisfactory results. Furthermore, the reaction mechanisms of the ternary ion‐association system are discussed. In addition, the polarization experiment revealed that the resonance light scattering (RLS) peak of Na2WO4‐6‐BA‐R6G consisted mainly of depolarized resonance fluorescence and resonance scattering. It was speculated that light emission fluorescence energy (EL) transformed into resonance light scattering energy (ERLS), which was a key reason for enhancement of RRS. Copyright © 2012 John Wiley & Sons, Ltd.
Keywords:6‐benzylaminopurine  rhodamine 6G  resonance Rayleigh scattering spectra  fluorescence spectra
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