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Steric Effects on the Formation of Self-Assembled Monolayers of Alicyclic Thiol Derivatives on Au(111)
Bulletin of the Korean Chemical Society ( IF 2.3 ) Pub Date : 2021-07-18 , DOI: 10.1002/bkcs.12364
Sicheon Seong 1 , Seungwook Kwon 1 , Seulki Han 1 , Young Ji Son 1 , Gaeun Lee 1 , Taeho Yang 1 , Nam‐Suk Lee 2 , Jaegeun Noh 1, 3
Affiliation  

To understand the steric effects on the formation of alicyclic thiolate self-assembled monolayers on Au(111), the surface structures and reductive desorption behaviors of self-assembled monolayers on Au(111) derived from cyclohexanethiol (CHT) and 1-methylcyclohexanethiols (MCHT) were characterized using scanning tunneling microscopy (STM) and cyclic voltammetry. STM observations showed that the adsorption of CHT on Au(111) resulted in the formation of well-organized monolayers with an unit cell of a = 14.5 ± 0.3 Å and b = 10.2 ± 0.3 Å, while the adsorption of MCHT with a methyl substituent bonded to the 1-position of the cyclohexyl ring resulted in the formation of a disordered phase. The reductive desorption potentials for CHT and MCHT monolayers on Au electrodes were observed at −0.984 and −0.974 V, respectively. This difference in potentials can be attributed to the difference in lateral interactions, which depend on the structural order of monolayers.

中文翻译:

对在 Au(111) 上形成脂环族硫醇衍生物自组装单层的空间效应

为了解在 Au(111) 上形成脂环族硫醇盐自组装单层的空间效应,从环己硫醇 (CHT) 和 1-甲基环己硫醇 (MCHT) 衍生的 Au(111) 上自组装单层的表面结构和还原解吸行为) 使用扫描隧道显微镜 (STM) 和循环伏安法进行表征。STM 观察表明 CHT 在 Au(111) 上的吸附导致形成组织良好的单层,晶胞为a  = 14.5 ± 0.3 Å 和b = 10.2 ± 0.3 Å,而甲基取代基与环己基环的 1-位键合的 MCHT 吸附导致无序相的形成。分别在 -0.984 和 -0.974 V 下观察到 Au 电极上 CHT 和 MCHT 单层的还原解吸电位。这种电位差异可归因于横向相互作用的差异,这取决于单层的结构顺序。
更新日期:2021-09-23
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