Probing Functional Group Specific Surface Interactions in Porous Solids Using ESR Spectroscopy as a Sensitive and Quantitative Tool
Probing Functional Group Specific Surface Interactions in Porous Solids Using ESR Spectroscopy as a Sensitive and Quantitative Tool
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DOI：
10.1021/jp310226f
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发表时间：
2013-01
影响因子：
3.7
通讯作者：
Martin Wessig;M. Drescher;S. Polarz
中科院分区：
文献类型：
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作者：
Martin Wessig;M. Drescher;S. Polarz
分子化合物与官能化表面之间的相互作用在许多领域无处不在。例如，它们在所有使用多孔主体的色谱过程中都是至关重要的。深入了解涉及表面相互作用的分子尺度过程的复杂相互作用是当前科学活动的一个问题。在本文中，我们讨论了ESR波谱作为一种功能强大且易于应用的工具来研究介孔材料中的主客体效应。对一系列改性介孔材料进行了测试，这些材料包括不同的表面官能团，如胺基、羧基等。氮氧化物分子自旋探针的转动特性有其特有的影响。从与温度相关的数据中，可以得出相互作用热等关键热力学参数。有可能(定性和定量地)区分主要与溶剂相互作用的流动自旋探针。
The interactions between molecular compounds and functionalized surfaces are omnipresent in many areas. For example, they are of crucial importance in all chromatographic processes using porous hosts. Developing a thorough understanding about the complex interplay of molecular scale processes involved in surface interactions is an issue of current scientific activity. In the present paper we discuss ESR spectroscopy as a powerful and easy to apply tool for examining host–guest effects within mesoporous materials. The method is tested for a series of modified, mesoporous materials comprising different surface functionalities like amine groups, carboxy groups, and others. There is a characteristic influence on the rotational characteristics of a molecular nitroxide spin probe. From temperature dependent data one can derive key thermodynamic parameters like interaction enthalpies. It is possible to differentiate (qualitatively and quantitatively) between mobile spin probes interacting mainly with the solvent...