Structure of Carboxyl-Acid-Terminated Self-Assembled Monolayers from Molecular Dynamics Simulations and Hybrid Quantum Mechanics–Molecular Mechanics Vibrational Normal-Mode Analysis
Self-assembled monolayers (SAMs) are excellent models for studying interfacial reactions and various properties of thin films. Carboxylic acid-terminated SAMs (CATSAMs) are of special interest because their surface properties are highly pH-dependent. To elucidate the complicated pH-dependent structu...
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Veröffentlicht in: | Journal of physical chemistry. C 2012-01, Vol.116 (1), p.770-782 |
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creator | Osnis, Alina Sukenik, Chaim N Major, Dan T |
description | Self-assembled monolayers (SAMs) are excellent models for studying interfacial reactions and various properties of thin films. Carboxylic acid-terminated SAMs (CATSAMs) are of special interest because their surface properties are highly pH-dependent. To elucidate the complicated pH-dependent structural properties of CATSAMs, we combine force-field molecular dynamics simulations with hybrid quantum mechanics-molecular mechanics (QM/MM) calculations of vibrational frequencies. These studies show that at low pH the carboxylic acids behave similarly to bulk carboxylic acids, hydrogen bonding mainly to the aqueous phase. With increasing pH, intralayer hydrogen bonds and monolayer disorder increase. The computed QM/MM vibrational data show that the observed range of carbonyl frequencies is due to inherent condensed phase properties of the CATSAMs such as fluctuating hydrogen bond environment and steric interactions. The results reported herein underscore the role H-bonding and steric congestion play in pH-dependent structural properties of CATSAMs. |
doi_str_mv | 10.1021/jp208443u |
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Carboxylic acid-terminated SAMs (CATSAMs) are of special interest because their surface properties are highly pH-dependent. To elucidate the complicated pH-dependent structural properties of CATSAMs, we combine force-field molecular dynamics simulations with hybrid quantum mechanics-molecular mechanics (QM/MM) calculations of vibrational frequencies. These studies show that at low pH the carboxylic acids behave similarly to bulk carboxylic acids, hydrogen bonding mainly to the aqueous phase. With increasing pH, intralayer hydrogen bonds and monolayer disorder increase. The computed QM/MM vibrational data show that the observed range of carbonyl frequencies is due to inherent condensed phase properties of the CATSAMs such as fluctuating hydrogen bond environment and steric interactions. 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C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Osnis, Alina</au><au>Sukenik, Chaim N</au><au>Major, Dan T</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structure of Carboxyl-Acid-Terminated Self-Assembled Monolayers from Molecular Dynamics Simulations and Hybrid Quantum Mechanics–Molecular Mechanics Vibrational Normal-Mode Analysis</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. C</addtitle><date>2012-01-12</date><risdate>2012</risdate><volume>116</volume><issue>1</issue><spage>770</spage><epage>782</epage><pages>770-782</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>Self-assembled monolayers (SAMs) are excellent models for studying interfacial reactions and various properties of thin films. Carboxylic acid-terminated SAMs (CATSAMs) are of special interest because their surface properties are highly pH-dependent. To elucidate the complicated pH-dependent structural properties of CATSAMs, we combine force-field molecular dynamics simulations with hybrid quantum mechanics-molecular mechanics (QM/MM) calculations of vibrational frequencies. These studies show that at low pH the carboxylic acids behave similarly to bulk carboxylic acids, hydrogen bonding mainly to the aqueous phase. With increasing pH, intralayer hydrogen bonds and monolayer disorder increase. The computed QM/MM vibrational data show that the observed range of carbonyl frequencies is due to inherent condensed phase properties of the CATSAMs such as fluctuating hydrogen bond environment and steric interactions. The results reported herein underscore the role H-bonding and steric congestion play in pH-dependent structural properties of CATSAMs.</abstract><cop>Columbus, OH</cop><pub>American Chemical Society</pub><doi>10.1021/jp208443u</doi><tpages>13</tpages></addata></record> |
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subjects | C: Surfaces, Interfaces, Catalysis Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology Lattice dynamics Materials science Methods of nanofabrication Phonons and vibrations in crystal lattices Physics Self-assembly |
title | Structure of Carboxyl-Acid-Terminated Self-Assembled Monolayers from Molecular Dynamics Simulations and Hybrid Quantum Mechanics–Molecular Mechanics Vibrational Normal-Mode Analysis |
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