Department of Chemistry and ‡Department of Physics, University of Southern California , Los Angeles, California 90089, United States.
J Phys Chem A. 2013 Nov 21;117(46):11933-9. doi: 10.1021/jp403183x. Epub 2013 Jun 20.
We demonstrate grafting of nitroxide radicals on the surface of nanodiamonds (NDs). The surface of NDs is functionalized by azide groups. Nitroxide radicals are covalently bonded using Cu(I)-catalyzed azide/alkyne-click chemistry approach. The reaction is confirmed by infrared spectroscopy. The grafting of nitroxides is also verified by studying the rotational correlational time using electron paramagnetic resonance (EPR) spectroscopy. EPR study estimates that a few hundreds (tens) of nitroxide radicals are grafted on the surface of NDs with 100 nm (25 nm) of the average diameter.
我们展示了在纳米金刚石（NDs）表面接枝氮氧自由基的方法。NDs 的表面通过叠氮基团进行功能化。氮氧自由基通过 Cu(I)-催化的叠氮化物/炔点击化学方法共价键合。反应通过红外光谱进行确认。通过电子顺磁共振（EPR）光谱研究旋转相关时间也验证了氮氧自由基的接枝。EPR 研究估计，在平均直径为 100nm（25nm）的 NDs 表面接枝了几百个（几十个）氮氧自由基。
