TY - JOUR
T1 - Vibrational Spectra of Thiolate-Protected Gold Nanocluster with Infrared Reflection Absorption Spectroscopy
T2 - Size- and Temperature-Dependent Ordering Behavior of Organic Monolayer
AU - Yokoyama, Takaho
AU - Hirata, Naoyuki
AU - Tsunoyama, Hironori
AU - Eguchi, Toyoaki
AU - Negishi, Yuichi
AU - Nakajima, Atsushi
N1 - Funding Information:
We are grateful to Dr. Masahiro Shibuta (Keio University) for providing information on cleaning a Au(111) surface. This work is partly supported by JSPS KAKENHI of Grants-in-Aid for Scientific Research (A) Grant Numbers 15H02002 and 19H00890 and of Challenging Research (Pioneering) Grant Number 17H06226. The computations were partly performed using Research Center for Computational Science Okazaki, Japan.
Funding Information:
We are grateful to Dr. Masahiro Shibuta (Keio University) for providing information on cleaning a Au(111) surface. This work is partly supported by JSPS KAKENHI of Grants-in-Aid for Scientific Research (A) Grant Numbers 15H02002 and 19H00890 and of Challenging Research (Pioneering) Grant Number 17H06226. The computations were partly performed using Research Center for Computational Science, Okazaki, Japan.
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2020/1/9
Y1 - 2020/1/9
N2 - Vibrational spectra of thiolate-protected gold nanoclusters, prepared in a monolayer manner using the Langmuir-Blodgett method, were measured by means of infrared reflection absorption spectroscopy (IRAS). A transferred monolayer of gold nanoclusters ligated by dodecanethiolate or 2-phenylethane-1-thiolate onto a single-crystal gold (Au) surface of Au(111) exhibits worthy IRAS spectra that reveal temperature-dependent behaviors from 100 to 340 K as well as comprehensive peak assignments based on density functional theory calculations: the conformation change in ligands between all trans and gauche defect forms with temperature. In addition to the temperature dependence, the cluster size dependence of alkyl and phenyl moieties is discussed, compared with the IRAS spectra of the corresponding self-assembled monolayers (SAMs) on Au(111). Ligands spreading three-dimensionally from the Au core determine the coordination structure of the ligated Au nanoclusters.
AB - Vibrational spectra of thiolate-protected gold nanoclusters, prepared in a monolayer manner using the Langmuir-Blodgett method, were measured by means of infrared reflection absorption spectroscopy (IRAS). A transferred monolayer of gold nanoclusters ligated by dodecanethiolate or 2-phenylethane-1-thiolate onto a single-crystal gold (Au) surface of Au(111) exhibits worthy IRAS spectra that reveal temperature-dependent behaviors from 100 to 340 K as well as comprehensive peak assignments based on density functional theory calculations: the conformation change in ligands between all trans and gauche defect forms with temperature. In addition to the temperature dependence, the cluster size dependence of alkyl and phenyl moieties is discussed, compared with the IRAS spectra of the corresponding self-assembled monolayers (SAMs) on Au(111). Ligands spreading three-dimensionally from the Au core determine the coordination structure of the ligated Au nanoclusters.
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U2 - 10.1021/acs.jpcc.9b07550
DO - 10.1021/acs.jpcc.9b07550
M3 - Article
AN - SCOPUS:85077117270
SN - 1932-7447
VL - 124
SP - 363
EP - 371
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 1
ER -