What is it about?
The design and synthesis of 1,3-dithiol linked acridinedione functionalized gold nanoparticles (ADDDTGNP) is described. ADDDT-GNP was characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), UV–vis, steady-state and time-resolved fluorescence techniques. Quantum chemical calcultions were carried out to understand the nature of bonding between the gold atoms in the nanoparticles and the capping 1,3-dithiol ligands .
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Why is it important?
Gold nanoparticles are stabilized through capping with a wide variety of organic ligands such as the 1,3- dithiol. The metal–ligand interactions in the organic-capping layer play a crucial role in the high performance materials. To understand the nature of bonding between the nanometal and the ligand molecules, we modelled the interaction between the different conformers of the dithiol and gold clusters .
Perspectives
Quantum chemical analysis of 1,3-dithiol ligands using density functional theory (DFT) reveals that they can cap on gold clusters through 1,2-capping mode, in which the two sulfur atoms of the dithiol bind covalently with two adjacent gold atoms on the surface of the cluster. The present study shows that three conformers of the ligand can cap in the 1,2-mode of capping. The triexponential fluorescence decay observed in the capped nanogold complex with fluorophore-labeled 1,3-dithiol may originate from the three conformers of the complex in the 1,2-capping mode.
E.J. Padma Malar
University of Madras
Read the Original
This page is a summary of: Acridinedione-functionalized gold nanoparticles and model for the binding of 1,3-dithiol linked acridinedione on gold clusters, Tetrahedron Letters, October 2010, Elsevier,
DOI: 10.1016/j.tetlet.2010.08.042.
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