We report the inversion of the role of Au(iii) chloride, from a gold precursor to an etchant, for the synthesis of smooth and spherical AuNPs with nanoscale size tunability in a one-pot-system. Inversion of the role of Au(iii) chloride was achieved by regulating the ratio between the reducing agent and Au(iii) chloride.
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http://dx.doi.org/10.1039/c9na00157c | DOI Listing |
Int J Biol Macromol
December 2024
Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon S7N 5C9, SK, Canada. Electronic address:
Precious metal recovery from secondary sources has received significant attention due to the reduced availability of precious metals from conventional sources. Herein, chitosan (CHT) was modified via cross-linking with glutaraldehyde (glu) to yield CHT-glu adsorbents with improved physicochemical and adsorption properties with precious metal ions (Au(III) and Pd(II)). CHT-glu adsorbents were prepared at variable glu ratios and characterized via complementary spectral (IR, C solids NMR, XPS) and thermogravimetry methods.
View Article and Find Full Text PDFDalton Trans
December 2024
Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA.
Rationalizing the impact of oxidation states of Au-based complexes on function require synthetic strategies that allow for conserved molecular formula in Au(I) and their Au(III) counterparts. Oftentimes achieving Au(I) and Au(III) coordination complexes with the same ligand system is challenging due to the reactivity and stability of the starting Au(I) or Au(III) starting materials. Thus, attempts to study the impact of oxidation state on biological function has been elusive.
View Article and Find Full Text PDFRSC Adv
November 2024
Biomaterials, Drug Delivery & Nanotechnology Unit, Centre for Biomedical & Biomaterials Research (CBBR), University of Mauritius Réduit 80837 Mauritius
Gold nanoparticles (AuNPs) exhibit different physical properties compared to small molecules, bulk materials and other nanoparticles. Their synthesis using plant extracts, particularly polyflavonoids as phytoreductants, for the conversion of Au(iii) into Au(0) has been reported. In this study, AuNPs were synthesized with extracts, sterols and pure compounds derived from marine sponges using gold(iii) chloride trihydrate.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
January 2025
Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza St, 11/12, 80-233 Gdańsk, Poland. Electronic address:
A range of novel simple gold(III) compounds has been synthesized in their monocrystalline form, including two previously unknown chloro-complexes of Au with 2-cyanopyridine or 3-cyanopyridine, respectively. Our investigations have revealed the intricate nature of the reaction between 2-cyanopyridine and tetrachloroauric acid, yielding at least three distinct products. The main product, obtained in high yield, is a salt featuring a tetrachloroauric anion and a pyridinium cation stabilized by a hydrogen bond to a further 2-cyanopyridine molecule.
View Article and Find Full Text PDFMolecules
May 2024
Kunming Institute for Food and Drug Control, Kunming 650034, China.
The recovery of valuable gold from wastewater is of great interest because of the widespread use of the precious metal in various fields and the pollution generated by gold-containing wastes in water. In this paper, a water-insoluble cross-linked adsorbent material (TE) based on cyanuric chloride (TCT) and ethylenediamine (EDA) was designed and used for the adsorption of Au(III) from wastewater. It was found that TE showed extremely high selectivity (D = 49,213.
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