Thermoresponse of Odd-Even Effect in n-Alkanethiolate Self-Assembled Monolayers on Gold Substrates

被引：12

作者：

Park, Sohyun ^{[1
]}

Kim, Eunchan ^{[1
,2
]}

Choi, Youngjin ^{[1
,2
]}

Jang, Jiung ^{[1
]}

Kwak, Kyungwon ^{[1
,2
]}

Cho, Minhaeng ^{[1
,2
]}

Yoon, Hyo Jae ^{[1
]}

机构：

[1] Korea Univ, Dept Chem, Seoul 02841, South Korea

[2] Ctr Mol Spect & Dynam, Inst Basic Sci IBS, Seoul 02841, South Korea

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2023年 / 29卷 / 15期

基金：

新加坡国家研究基金会;

关键词：

contact angle goniometry; heat; odd-even effects; self-assembled monolayers; sum-frequency-generation spectroscopy; METAL-SURFACES; THERMAL CONDUCTANCE; MOLECULAR-DYNAMICS; RECTIFICATION; SPECTROSCOPY; WETTABILITY; DEPENDENCE; JUNCTIONS; WATER; AREA;

D O I：

10.1002/chem.202203536

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study examines thermoresponse of odd-even effect in self-assembled monolayers (SAMs) of n-alkanethiolates (SCn, n=3-18) formed on template-stripped gold (Au-TS) using macro- and microscopic analytical techniques, contact angle goniometry (CAG) and vibrational sum frequency generation (VSFG) spectroscopy, respectively. Both CAG and VSFG analyses showed that the odd-even effect in liquid-like SAMs (n=3-9) disappeared upon heating at 50-70 degrees C, indicating that the heating led to increased structural disorder regardless of odd and even carbon numbers. In contrast, the opposite thermoresponse was observed for odd and even SCn molecules in wax- and solid-like SAMs (n=10-18). Namely, temperature-dependent orientational change of terminal CH3 relative to the surface normal was opposite for the odd and even molecules, thereby leading to mitigated odd-even effect. Our work offers important insights into thermoresponse of supramolecular structure in condensed organic matter.

引用

页数：6

共 48 条

[21] Wettability of graphene and interfacial water structure [J].