Synthesis of Water-Soluble 2,2′-Diphenyl-1-Picrylhydrazyl Nanoparticles: A New Standard for Electron Paramagnetic Resonance Spectroscopy

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• 作者：Ou Chen ; Jiaqi Zhuang ; Fabrizio Guzzetta ; Jared Lynch ; Alexander Angerhofer ; Y. Charles Cao
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：September 9, 2009
• 年：2009
• 卷：131
• 期：35
• 页码：12542-12543
• 全文大小：161K
• 年卷期：v.131,no.35(September 9, 2009)
• ISSN：1520-5126

文摘

This communication reports a size-controlled synthesis of water-soluble 2,2′-diphenyl-1-picrylhydrazyl (DPPH) nanoparticles (NPs). These nanoparticles exhibit size-dependent absorption spectra and fast spin exchange-narrowed single-line EPR spectra. The linewidths of the EPR spectra of these water-soluble nanoparticles are 1.5−1.8 G, which are equal or close to the narrowest line width (1.5 G) of the common DPPH standard in the form of water-insoluble microcrystals. In addition, these NPs are stable over a wide pH range of 3.0 to 10.0. These properties make these water-soluble DPPH NPs suitable for use as a new type of EPR standard, which is important for fundamental research and practical applications in fields such as the food industry and the life sciences. Furthermore, the DPPH NPs can potentially be used as a spin probe in biomedical studies.