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Citation: LI Xiaoyan, YANG Jidong. Absorption and Resonance Rayleigh Scattering Spectra of 6-Benzylaminopurine-Cu(Ⅱ)-Triphenylmethane Dyes Systems and Their Analytical Applications[J]. Chinese Journal of Applied Chemistry, ;2012, 29(4): 446-454. doi: 10.3724/SP.J.1095.2012.00305 shu

Absorption and Resonance Rayleigh Scattering Spectra of 6-Benzylaminopurine-Cu(Ⅱ)-Triphenylmethane Dyes Systems and Their Analytical Applications

LI Xiaoyan ^a ,
YANG Jidong ^a,b,c,,

1.
a School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China;
2.
b School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China;
3.
c School of Environmental Science and Chemistry, Chongqing Three Gorges University, Chongqing 404000, China

Corresponding author: YANG Jidong,
Received Date: 14 July 2011
Available Online: 2 September 2011
Fund Project: 国家自然科学基金(21175015)资助项目 (21175015)教育部基金项目春晖计划(Z2009-1-63003) (Z2009-1-63003)

In HAc-NaAc buffer medium with pH=5.37~5.58,6-benzylaminopurine(6-BA) reacted with Cu(Ⅱ) to form a chelate[6-BA·Cu]²⁺,which further reacted with triphenylmethane dyes to form 2:1(Lissamine green system),3:1(fast green system) and 2.5:1(water-soluble aniline blue system) ternary ion-associations,respectively.It resulted in the change of the absorption spectra,the great enhancement of resonance Rayleigh scattering(RRS) spectra and frequency doubling scattering(FDS) intensities.The maximum RRS wavelengths were all located at 372 nm.And the increased amount of absorption,the enhancement degree of RRS(ΔI_RRS),FDS(ΔI_FDS) were all proportional to the concentration of 6-BA during a certain range.The detection limits of methods for Lissamine green system were 5.48 μg/L,119.70 μg/L and 64.20 μg/L,respectively.Therefore,a sensitive method for determination of trace 6-BA with RRS spectrum in 6-BA-Cu(Ⅱ)-LG system has been developed.The method could be applied to the determination of 6-BA in bean sprouts with satisfactory results.In this paper,we used Gaussview 3.07 and Gaussian 03W softwares at a B3LYP/6-31G(base group) level based on the density functional theory(DFT) to calculate the charge distribution of 6-BA.Furthermore,the reaction mechanism and the main reasons for the enhancement of RRS of the Lissamine green system were preliminarily discussed.
- benzylaminopurine,
- resonance Rayleigh-scattering,
- frequency doubling scattering
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