Steric Effects on the Formation of Self-Assembled Monolayers of Alicyclic Thiol Derivatives on Au(111),Bulletin of the Korean Chemical Society

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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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