title: One-pot green synthesis of luminescent gold nanoparticles using imidazole derivative of chitosan.
abstract: Water soluble luminescent gold nanoparticles with average size 2.3nm were for the first time synthesized by completely green method of Au(III) reduction using chitosan derivative-biocompatible nontoxic N-(4-imidazolyl)methylchitosan (IMC) as both reducing and stabilizing agent. Reduction of Au(III) to gold nanoparticles in IMC solution is a slow process, in which coordination power of biopolymer controls both reducing species concentration and gold crystal growth rate. Gold nanoparticles formed in IMC solution do not manifest surface plasmon resonance, but exhibit luminescence at 375nm under UV light excitation at 230nm. Due to biological activity of imidazolyl-containing polymers and their ability to bind proteins and drugs, the obtained ultra-small gold nanoparticles can find an application for biomolecules detection, bio-imaging, drug delivery, and catalysis. Very high catalytic activity (as compared to gold nanoparticles obtained by other green methods) was found for Au/IMC nanoparticles in the model reaction of p-nitrophenol reduction providing complete conversion of p-nitrophenol to p-aminophenol within 180-190s under mild conditions.
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Nazirov
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia; I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of Russian Academy of Sciences, 20, S. Kovalevskoy Str., Yekaterinburg 620990, Russia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Pestov
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia.
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Privar
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Ustinov
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia; Far Eastern Federal University, 8, Sukhanova Str., Vladivostok 690950, Russia.
authors.forename: Evgeny
authors.initials: E
authors.lastname: Modin
authors.affiliation: Institute of Chemistry, Far East Branch of Russian Academy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia. Electronic address: sbratska@ich.dvo.ru.
authors.forename: Svetlana
authors.initials: S
authors.lastname: Bratskaya
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry; D060326:Chemistry Techniques, Synthetic; D006046:Gold / Q000737:chemistry*; D055772:Green Chemistry Technology; D007093:Imidazoles / Q000737:chemistry*; D049408:Luminescent Agents / Q000138:chemical synthesis* / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D007093:Imidazoles; D049408:Luminescent Agents; D006046:Gold
keywords: Catalysis; Chitosan; Gold; Imidazolyl derivatives; Luminescence; Ultrasmall nanoparticles