Small Gold Nanoparticles Synthesized with Sodium Citrate and Heavy Water: Insights into the Reaction Mechanism

Abstract

5 páginas, 3 figuras, 1 esquema.The effect of solvent isotopic replacement (H for D) on the size of gold nanoparticles (Au NPs) prepared by sodium citrate reduction has been investigated. With increasing replacement of water by deuterium oxide, smaller sizes of Au NPs are obtained, which is interpreted as a consequence of a faster reduction. A mechanism in which a substitution complex, [AuCl3(C6H5O7)−2]−, is formed from AuCl4 and citrate ions prior to its rate-limiting disproportionation into products is suggested. This novel procedure offers an attractive alternative to the existing ones and opens a full range of possibilities for biological studies.The work is supported in part by Ministerio de Ciencia e Innovación under grant numbers PTQ-06-2-0839 (for I.O.-J.) and Consolider Nanobiomed Ingenio 2010.Peer reviewe