Molecular Probe Location in Reverse Micelles Determined by NMR Dipolar Interactions

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• 作者：Debbie C. Crans ; Christopher D. Rithner ; Bharat Baruah ; Bridget L. Gourley ; and Nancy E. Levinger
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：April 5, 2006
• 年：2006
• 卷：128
• 期：13
• 页码：4437 - 4445
• 全文大小：125K
• 年卷期：v.128,no.13(April 5, 2006)
• ISSN：1520-5126

文摘

The location and interactions of solutes in microheterogeneous environments, such as reversemicelles, critically influence understanding of many phenomena that utilize probe molecules to characterizeproperties in chemical, biological, and physical systems. The information gained in such studies dependssubstantially on the location of the probe used. Often, intuition leads to the assumption that ionic probemolecules reside in the polar water pool of a system. In this work, the location of a charged polar transitionmetal coordination complex in a reverse micellar system is determined using NMR spectroscopy. Despitethe expected Coulomb repulsion between the surfactant headgroups and the negatively charged complex,the complex spends significant time penetrating into the hydrophobic portion of the reverse micellar interface.These results challenge the assumption that ionic probe molecules reside solvated by water inmicroheterogeneous environments and suggest that probe molecule location be carefully considered beforeinterpreting data from similar systems.