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The di(thiourea)gold(I) complex [Au{S=C(NH2)2}2][SO3Me] as a precursor for the convenient preparation of gold nanoparticles.
- Source :
- Zeitschrift für Naturforschung B: A Journal of Chemical Sciences; Mar2020, Vol. 75 Issue 3, p239-249, 11p
- Publication Year :
- 2020
-
Abstract
- The synthesis of [Au{S=C(NH<subscript>2</subscript>)<subscript>2</subscript>}<subscript>2</subscript>][SO<subscript>3</subscript>Me] (1) (a) by the anodic oxidation of gold metal in an anolyte of thiourea and methansulfonic acid and (b) by the reaction of Au(OH)<subscript>3</subscript> with an aqueous solution of methanesulfonic acid in the presence of thiourea is reported. The structure of 1 in the solid state has been determined by single-crystal X-ray diffraction showing a linear S–Au–S unit with the thiourea ligands in a leaflet structure folded by 113.2(3)°. The cation of complex 1 is a dimer, based on short S · · · C interactions between two adjacent mononuclear cations. The thermal decomposition behavior of 1 was studied by TG and TG-MS confirming that it decomposes under inert gas or oxygen atmosphere in four steps in the temperature range of 200–650°C. Initial decomposition starts with the release and fragmentation of one of the thiourea ligands, followed by the anion degradation. Powder X-ray diffraction studies specified the formation of gold metal. Based on this observation, complex 1 was used as precursor for the formation of gold nanoparticles (Au NPs) in 1-hexadecylamine (c = 4.0 mol L<superscript>−1</superscript>) at T = 330°C without any addition of reducing agents. TEM, electron diffraction, and UV/Vis spectroscopy studies were carried out. Au NPs of size 15 ± 4 nm were formed, showing the characteristic surface plasmon resonance at 528 nm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09320776
- Volume :
- 75
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Zeitschrift für Naturforschung B: A Journal of Chemical Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 142043303
- Full Text :
- https://doi.org/10.1515/znb-2019-0213