Cationic self-assembled monolayers composed of gemini-structured sulfur compounds on gold : A new approach to control ionic functions on surfaces and chiral detection.

金上由双子结构硫化合物组成的阳离子自组装单层：一种控制表面离子功能和手性检测的新方法。

基本信息

批准号：
15310098
负责人：
TAMADA Kaoru
金额：
$ 10.05万
依托单位：
Tokyo Institute of Technology (2005-2006)National Institute of Advanced Industrial Science and Technology (2003-2004)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Cationic self-assembled monolayers (SAMs) composed of quaternary ammonium (QA) sulfur derivatives have been synthesized to control the distance between charged head groups on gold substrates. Two molecules bearing resembling molecular structures, "gemini"-structured didodecyl dithiol (HS-gQA-SH) and didodecyl disulfide (QA-SS-QA) or dodecyl thiol (QA-SH), were utilized in this study, and the formation and structure of the SAMs were characterized by surface plasmon resonance spectroscopy (SPR), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared-reflection adsorption spectroscopy (FTIR-RAS) and Kelvin Probe method. In the HS-gQA-SH SAM, the orientation and distance between QA groups are specified by the covalent bonding with ethylene spacer, while those of the QA-SS-QA SAM and QA-SH are determined by the electric repulsion between charged head groups, that is, QA groups in the QA-SS-QA SAM and QA-SH are more randomly located, being more distant than with those in the HS-gQA-SH SAM. Contact potential difference data obtained by KP suggested the existence of much larger dipoles on HS-gQA-SH SAM compared with on QA-SH SAM as a result of higher density of the functional group.We found that L-tartaric acid (TA), a probe molecule with two carboxyl groups having the distance of an ethylene unit, exhibits a strong affinity on the HS-gQA-SH SAM. In contrast, a specific binding was little observed on the QA-SS-QA SAM and QA-SH SAM. We demonstrate the crystal growth of L-TA on TA enantiomers (L or D-TA) immobilized QA-SH SAM, and found selective crystal growth on the same chiral surfaces (L-TA on L-TA). We have also tried one-step synthesis of gold nanoparticles capped by the QA-SS-QA SAM in this study.

已经合成了由Quaternary铵（QA）硫衍生物组成的阳离子自组装单层（SAM），以控制金底物上带电的头部基团之间的距离。在这项研究中，在这项研究中使用了类似于分子结构的两个分子，具有类似于分子结构的分子，“双子座”结构化的二二烷基二硫醇（HS-GQA-SH）和二二二烷基二硫化物（QA-SS-QA）或十二烷基硫醇（qa-sh），在这项研究中使用了Sams的形成和结构（由Sams的形成和结构表征）。（XPS）和傅立叶转化红外反射吸附光谱（FTIR-RAS）和开尔文探针方法。在HS-GQA-SH SAM中，QA组之间的方向和距离是通过与乙烯间隔的共价键指定的，而QA-SS-QA SAM和QA-SH的QA-SS-QA SAM和QA-SH的确定是由带电的头部组之间的电排斥力来确定的，即QA-SS-SS-SS-SS-SS-SS-SH和QA-SH的QA基团之间的QA sam和Sams更为远的SAM，SAM与SAM相比，SHA更为远。 KP获得的接触电势差数据表明，由于功能组的密度较高，HS-GQA-SH SAM上存在更大的偶极子。相反，在QA-SS-QA SAM和QA-SH SAM上几乎没有观察到特定的结合。我们证明了L-TA在TA映体（L或D-TA）上固定的QA-SH SAM的晶体生长，并在同一手性表面（L-TA）上发现了选择性晶体生长。在这项研究中，我们还尝试了由Qa-SS-QA SAM限制的金纳米颗粒的一步合成。