在pH值为5.37～5.58的HAc-NaAc缓冲溶液中,6-苄氨基嘌呤(6-BA)能与Cu(Ⅱ)反应生成螯合物[6-BA·Cu]2+,可再与三苯甲烷类染料形成三元离子缔合物,其摩尔比分别为2∶1(里斯沙明绿)、3∶1(固绿)和2.5∶1(水溶性苯胺蓝).反应体系的吸收光谱发生变化,其共振瑞利散射光谱(RRS)和倍频散射(FDS)显著增强,3个体系的最大RRS峰均位于372 nm附近,6-BA浓度在一定范围内的增加与相应的RRS强度( △IRRs)、FDS( △IFDS)强度和吸光度(△A)均呈线性关系.其RRS检出限分别为5.48 μg/L(里斯沙明绿)、18.43 μg/L(固绿)和9.34 μg/L(水溶性苯胺蓝).据此建立6-BA-Cu(Ⅱ)-里斯沙明绿染料体系测定痕量6-BA的RRS法,并用于豆芽中6-BA的快速测定,结果令人满意.此外,还应用计算化学软件Gaussview3.07和Gaussian03W,采用密度泛函法,在B3 LYP/6 -31G基组水平上计算6-BA的电荷分布,并对里斯沙明绿体系的反应机理及RRS增强的主要原因进行了初步探讨.
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