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Abstract
This paper examines thermoresponse of odd-even effect in self-assembled monolayers (SAMs) of n-alkanethiolates (SCn, n = 3 – 18) formed on template-stripped gold (AuTS) 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 °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.
Supplementary materials
Title
Thermoresponse of Odd-Even Effect in Self-Assembled Monolayers
Description
The supporting information of 'Thermoresponse of odd-even effect in self assembled monolayers' provides detailed experimental and calculational methods with supplementary figures and tables. In experimental section, sample preparation and experimental methods of static contact angle measurements and vibrational sum frequency generation spectroscopy are described. In calculation section, distribution calculation and spectrum modeling for VSFG signal analysis are described.
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