Ultrasmall NHC-coated gold nanoparticles obtained through solvent free thermolysis of organometallic Au(I) complexes

Julián Crespo; Yannick Guari; Alfonso Ibarra; Joulia Larionova; Tania Lasanta; Danielle Laurencin; José M. López-de-Luzuriaga; Miguel Monge; M. Elena Olmos; Sébastien Richeter

doi:10.1039/C4DT02160F

Ultrasmall NHC-coated gold nanoparticles obtained through solvent free thermolysis of organometallic Au(i) complexes†

Julián Crespo,^a Yannick Guari,*^b Alfonso Ibarra,^c Joulia Larionova,^b Tania Lasanta,^a Danielle Laurencin,^b José M. López-de-Luzuriaga,^a Miguel Monge,*^a M. Elena Olmos^a and Sébastien Richeter^b

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^a Departamento de Química, Universidad de La Rioja, Centro de Investigación en Síntesis Química (CISQ). Complejo Científico-Tecnológico, 26004-Logroño, Spain
E-mail: miguel.monge@unirioja.es
Tel: +34 941299644

^b Institut Charles Gerhardt Montpellier, UMR5253, Chimie Moléculaire et Organisation du Solide, Université Montpellier II, Place E. Bataillon, Montpellier cedex 5, France
E-mail: yannick.guari@univ-montp2.fr
Fax: +33 467143852
Tel: +33 467144224

^c Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragon (INA), Universidad de Zaragoza, 50018-Zaragoza, Spain

Abstract

Ultrasmall gold nanoparticles (Au UNPs) represent a unique class of nanomaterials making them very attractive for certain applications. Herein, we developed an organometallic approach to the synthesis of Au UNPs stabilized with the C₁₈H₃₇-NHC ligand by the solvent free thermolysis of [RMIM][Au(C₆F₅)₂] (1) or [Au(C₆F₅)(RNHC)] (3) (with R = C₁₈H₃₇-), by controlling the reactivity of pentafluorophenyl ligands as deprotonating or reductive elimination agents; Au UNPs can be achieved by solvent free thermolysis. Pentafluorophenyl Au(I) complexes 1 and 3 are synthesized from the corresponding ionic and neutral precursors. The presence of long alkyl chain imidazolium or carbene species in the complexes makes them to behave as isotropic liquids at moderate temperatures. The use of multinuclear NMR allows the description of the mechanism of formation of the UNPs as well as the surface state of the UNPs.

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Ultrasmall NHC-coated gold nanoparticles obtained through solvent free thermolysis of organometallic Au(i) complexes†

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