A study on the adsorption structure of an adhesive monomer for precious metals by surface-enhanced Raman scattering spectroscopy.
A study on the adsorption structure of an adhesive monomer for precious metals by surface-enhanced Raman scattering spectroscopy.
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表面增强拉曼散射光谱研究贵金属粘合剂单体的吸附结构。
DOI：
10.1016/s0142-9612(98)00238-5
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发表时间：
1999
期刊：
影响因子：
14
通讯作者：
Y. Kadoma
中科院分区：
文献类型：
--
作者：
M. Suzuki;A. Fujishima;T. Miyazaki;H. Hisamitsu;K. Kojima;Y. Kadoma
为了阐明底漆对牙科贵金属和树脂之间粘附的作用，应用表面增强拉曼散射（SERS）技术对吸附在胶体金表面的粘附单体6-（N-（4-乙烯基苄基）丙氨基）-1,3,5-三嗪-2,4-二硫酮（VBATDT）进行结构分析。 VBATDT 是商业底漆的主要成分之一。用 Kr 离子激光器的 647.1nm 线照射 VBATDT 的甲醇溶液和 Au 胶体水溶液的混合物，以获得 SERS。固体VBATDT拉曼光谱中由于CS伸缩而产生的458cm-1处最强烈的峰在SERS中完全消失，而由乙烯基苄基振动引起的所有其他峰保持不变。这表明VBATDT在Au上吸附后发生了一些涉及CS键的结构变化，并且分子在吸附过程中发生了硫酮-硫醇型互变异构化。含有 VBATDT 的商业底漆的 SERS 光谱表现出类似的光谱模式。目前的结果使我们得出结论，VBATDT 的硫原子与 Au 表面之间存在一些特定的相互作用，形成化学键，可有效提高牙科贵金属与树脂之间的结合强度。引物的矛盾性质、储存中的化学稳定性和对金的化学亲和力，也可以通过基于光谱证据的 VBATDT 的硫酮-硫醇型互变异构来解释。
In order to clarify the role of a primer on the adhesion between dental precious metals and resin, surface-enhanced Raman scattering (SERS) technique has been applied to the structural analysis of the adhesive monomer, 6-(N-(4-vinylbenzyl)propylamino)-1,3,5-triazine-2,4-dithione (VBATDT) adsorbed on colloidal Au surfaces. VBATDT is one of the major components of commercial primers. A mixture of a methanol solution of VBATDT and aqueous Au colloid was illuminated by the 647.1nm line from a Kr ion laser to obtain the SERS. The most intense peak at 458cm-1due to CS stretching in the Raman spectrum of solid VBATDT disappears completely in the SERS, while all the other peaks due to vinylbenzyl group vibrations remain unchanged. It suggests that some structural change occurs in VBATDT upon adsorption on Au which involves the CS bonds and that the molecule undergoes thione-thiol-type tautomerization in the adsorption process. The SERS spectrum of a commercial primer containing VBATDT exhibits a similar spectral pattern. The present results lead us to conclude that some specific interactions exist between the sulfur atoms of VBATDT and Au surface to form chemical bond likes, which are effective to improve the bond strength between dental precious metals and resin. The ambivalent properties of the primer, chemical stability in storage and chemical affinity to Au, are also explained by the thione–thiol-type tautomerization of VBATDT on the basis of the spectroscopic evidence.