Issue 35, 2013

From Au(i) organometallic hydrogels to well-defined Au(0) nanoparticles

Abstract

The reaction of water soluble phosphine 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane (DAPTA) with [Au(C[triple bond, length as m-dash]C–C5H4N)]n yields a luminescent water soluble phosphine gold(I) alkynyl complex [Au(4-pyridylethynyl)(DAPTA)] that leads to the formation of a luminescent hydrogel. A small variation of the phosphine structure (introduction of acetyl groups) with respect to the previously reported complex [Au(4-pyridylethynyl)(PTA)] has a clear effect on the observed properties: (i) a great increase in the hydrogel entanglement structure has been observed; (ii) the different cross-linking structures give rise to specific emission properties. The hydrogel was characterized by different techniques (1H-NMR, absorption and emission spectroscopy, optical microscopy, fluorescent microscopy (FM) and SEM). FM together with microspectrofluorimetry measurements has determined different emissive properties that vary according to the cross-linking process. Thermal treatments of the hydrogel produce well-defined metallic gold nanoparticles with a remarkable narrow size distribution, which have been characterized by SEM, TEM and X-ray photoelectron spectroscopy (XPS). At 200 °C, Au particles measuring 1.0 ± 0.2 nm were obtained. Au nanoparticles were also formed as a result of electron beam irradiation.

Graphical abstract: From Au(i) organometallic hydrogels to well-defined Au(0) nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
17 Jun 2013
Accepted
15 Jul 2013
First published
16 Jul 2013

J. Mater. Chem. C, 2013,1, 5538-5547

From Au(I) organometallic hydrogels to well-defined Au(0) nanoparticles

E. Aguiló, R. Gavara, J. C. Lima, J. Llorca and L. Rodríguez, J. Mater. Chem. C, 2013, 1, 5538 DOI: 10.1039/C3TC31168F

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