基于联苯的硫醇自组装单分子层中的多态性。

Polymorphism in biphenyl-based self-assembled monolayers of thiols.

作者信息

Cyganik Piotr, Buck Manfred

机构信息

School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, UK.

出版信息

J Am Chem Soc. 2004 May 19;126(19):5960-1. doi: 10.1021/ja049146e.

DOI:10.1021/ja049146e

PMID:15137749

Abstract

Self-assembled monolayers of omega-(4'-methylbiphenyl-4-yl) butanethiol (H3C-C6H4-C6H4-(CH2)n-SH) on Au(111) substrates were investigated with scanning tunneling microscopy and contact angle measurements. A striking polymorphism was observed upon annealing, and structural changes were paralleled by a switch in stability against exchange by other thiols from unstable to stable. The phase formed at temperatures above 413 K was characterized by a very high structural perfection over areas exceeding 105 nm2. The results suggest an additional dimension in the control of structure and properties of thiol monolayers if different factors contributing to the energetics of SAMs enter in a competing rather than a cooperative way.

摘要

通过扫描隧道显微镜和接触角测量对ω-（4'-甲基联苯-4-基）丁硫醇（H3C-C6H4-C6H4-(CH2)n-SH）在金（111）衬底上的自组装单分子层进行了研究。退火后观察到显著的多晶型现象，结构变化伴随着对其他硫醇交换稳定性的转变，从不稳定变为稳定。在高于413 K的温度下形成的相在超过105 nm2的区域具有非常高的结构完美度。结果表明，如果影响自组装单分子层能量学的不同因素以竞争而非协同的方式起作用，那么在控制硫醇单分子层的结构和性质方面会有一个额外的维度。