关于纯度对硫氰酸盐自组装单分子层形成的重要性。

On the importance of purity for the formation of self-assembled monolayers from thiocyanates.

作者信息

Shen Cai, Buck Manfred, Wilton-Ely James D E T, Weidner Tobias, Zharnikov Michael

机构信息

EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom.

出版信息

Langmuir. 2008 Jun 1;24(13):6609-15. doi: 10.1021/la8004272. Epub 2008 May 27.

DOI:10.1021/la8004272

PMID:18503286

Abstract

Assembly of dodecyl thiocyanate (C12SCN) from ethanol solution onto Au(111)/mica substrates was investigated by scanning tunneling microscopy (STM), near edge X-ray absorption fine structure spectroscopy (NEXAFS), X-ray photoelectron spectroscopy (XPS), and infrared reflection-absorption spectroscopy (IRRAS). Contrary to previous reports, thiolate monolayers formed by cleavage of the S-CN bond can be obtained whose quality is at least as good as that of self-assembled monolayers (SAMs) formed directly from the thiol analogue of C12SCN, dodecanethiol (C12SH). However, the achievable quality is strikingly dependent on the purity of the thiocyanate with even low levels of contamination impeding the formation of structurally well-defined monolayers.

摘要

通过扫描隧道显微镜（STM）、近边X射线吸收精细结构光谱（NEXAFS）、X射线光电子能谱（XPS）和红外反射吸收光谱（IRRAS）研究了十二烷基硫氰酸盐（C12SCN）从乙醇溶液在Au(111)/云母衬底上的组装。与先前的报道相反，可以得到通过S-CN键断裂形成的硫醇盐单层，其质量至少与直接由C12SCN的硫醇类似物十二烷硫醇（C12SH）形成的自组装单层（SAMs）一样好。然而，可达到的质量显著依赖于硫氰酸盐的纯度，即使是低水平的污染也会阻碍结构明确的单层的形成。