Thermoreversible Reactions on Inorganic Nanoparticle Surfaces: Diels–Alder Reactions on Sterically Crowded Surfaces
作者:Tom Engel、Guido Kickelbick
DOI:10.1021/cm303049k
日期:2013.1.22
reactions were based on simple radical additions. However, novel smart materials require reversible reactions. These reactions, such as the Diels–Alder reaction, often have a specific sterical demand, e.g., a six-centered transition state. In this study, < 5 nm silica particles were functionalized with maleimide groups, and their reactivity with regard to Diels–Alder reactions were investigated, applying
有机表面官能化的纳米粒子是纳米复合材料的重要交联剂。过去,许多交联反应都是基于简单的自由基加成。但是,新型智能材料需要可逆反应。这些反应,例如狄尔斯-阿尔德反应,通常具有特定的空间需求,例如六中心过渡态。在这项研究中,使用马来酰亚胺基团对小于5 nm的二氧化硅颗粒进行了功能化,并使用各种技术研究了它们对Diels–Alder反应的反应性。提出了一种用于二氧化硅纳米粒子表面改性的新方法,该方法可最大程度地减少有机溶剂中的团聚,从而增加官能团在颗粒表面上的可及性。进行了取代模型化合物的动力学研究,以评估马来酰亚胺官能团的反应性。2,5-二甲基呋喃与Ñ -propylmaleimide,ñ -乙基(Ñ -propylcarbamato)马来酰亚胺,和Ñ苯基马来随后通过UV / Vis光谱。反应速率以此顺序增加,显示出马来酰亚胺取代的效果。之后N-((3-三乙氧基甲硅烷基)丙基)马来酰亚胺用于将马