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Steric Effects on the Formation of Self‐Assembled Monolayers of Alicyclic Thiol Derivatives on Au(111)
Author(s) -
Seong Sicheon,
Kwon Seungwook,
Han Seulki,
Son Young Ji,
Lee Gaeun,
Yang Taeho,
Lee NamSuk,
Noh Jaegeun
Publication year - 2021
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12364
Subject(s) - monolayer , alicyclic compound , chemistry , steric effects , substituent , scanning tunneling microscope , desorption , cyclic voltammetry , adsorption , self assembled monolayer , crystallography , stereochemistry , nanotechnology , electrode , organic chemistry , materials science , electrochemistry , biochemistry
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.