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用共振Rayleigh散射(RRS)光谱并结合吸收光谱和荧光光谱研究了金纳米微粒与藏红T(ST)的相互作用.在pH5左右的柠檬酸盐介质中,柠檬酸根(H2L)2?自组装于带正电荷的金纳米微粒表面,形成[(Au)n(H2L)m]x?复合物.此时(H2L)2?的一个羧基氧原子向内结合于金纳米微粒表面,另一个羧基氧原子向外形成带x个负电荷的超分子复合阴离子,此时它再与藏红T阳离子借静电引力、疏水作用力和电荷转移作用形成新的结合产物.这里(H2L)2?起了“桥”的作用.讨论了结合产物在引起吸收光谱红移,金纳米微粒等离子体吸收带降低和荧光猝灭的同时,将导致RRS的急剧增强并出现新的RRS光谱.研究了金纳米微粒与藏红T相互作用对RRS、吸收光谱和荧光光谱的影响,结合产物引起RRS增强的原因,并结合量子化学方法对于反应机理进行了探讨,认为RRS光谱不仅可对纳米微粒及其反应产物的研究提供新的信息并且也可作为表征和检测纳米微粒的一种灵敏手段.
The interaction of gold nanoparticles with safranin T (ST) was studied by resonance Rayleigh scattering (RRS) spectroscopy and absorption and fluorescence spectroscopy. In citrate media at pH 5, the self-assembly of citrate (H2L) 2? On the surface of the positively charged gold nanoparticles, a [(Au) n (H2L) m] x? Complex is formed, in which case a carboxyl oxygen atom of (H2L) 2? Is bound inwardly to the surface of the gold nanoparticle and the other carboxyl group The oxygen atom forms a supramolecular complex anion with x negative charges outward, at which point it forms a new binding product with the red T cation by electrostatic attraction, hydrophobic force and charge transfer. The effect of “bridge” was discussed, which led to the sharp increase of RRS and the appearance of new RRS spectra, which led to the red shift of the absorption spectrum, the decrease of the absorption band of the gold nanoparticles and the fluorescence quenching, And Raney red T interaction on the RRS, absorption and fluorescence spectra, combined with the products cause RRS enhancement reasons, combined with quantum chemistry method for the reaction mechanism was discussed RRS spectroscopy not only for nanoparticles and their reaction products Research provides new Information and may also be characterized and used as a sensitive means of detecting nanoparticles.