有机硫物种在水表面的吸附：分子键合与取向

Adsorption of organosulfur species at aqueous surfaces: molecular bonding and orientation.

作者信息

Tarbuck Teresa L, Richmond Geraldine L

机构信息

Materials Science Institute and Department of Chemistry, University of Oregon, Eugene, OR 97403, USA.

出版信息

J Phys Chem B. 2005 Nov 10;109(44):20868-77. doi: 10.1021/jp058123z.

DOI:10.1021/jp058123z

PMID:16853706

Abstract

Four sulfur-containing compounds important to tropospheric chemistry have been examined at the vapor/H2O and vapor/D2O interfaces. These adsorbates, DMS, DMSO, DMSO2, and DMSO3, were studied by surface tension and vibrational sum-frequency spectroscopy (VSFS). Each adsorbate is surface active and each orients with the hydrophobic methyl groups pointed out of the plane of the interface. Their influence on the interfacial water structure is adsorbate dependent. Strong and weak interactions with surface water are observed as well as reorientation of subsurface water molecules, resulting in an increase in interfacial thickness.

摘要

对对流层化学重要的四种含硫化合物已在蒸汽/H₂O和蒸汽/D₂O界面进行了研究。通过表面张力和振动和频光谱（VSFS）对这些吸附质，即二甲基硫（DMS）、二甲基亚砜（DMSO）、二甲基亚砜₂（DMSO₂）和二甲基亚砜₃（DMSO₃）进行了研究。每种吸附质都具有表面活性，且每种吸附质的取向都是疏水甲基指向界面平面之外。它们对界面水结构的影响取决于吸附质。观察到了与表面水的强相互作用和弱相互作用以及次表层水分子的重新取向，导致界面厚度增加。