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Title: Preparation and characterization of Cr(CO)4dpp (chromium tetracarbonyl 2,3-bis(2′-pyridyl)pyrazine) adsorbed on silver nanoparticles
Authors: Tan, H.
Wong, L.
Lai, M.Y.
Kiruba, G.S.M. 
Leong, W.K. 
Wong, M.W. 
Fan, W.Y. 
Issue Date: 27-Oct-2005
Citation: Tan, H., Wong, L., Lai, M.Y., Kiruba, G.S.M., Leong, W.K., Wong, M.W., Fan, W.Y. (2005-10-27). Preparation and characterization of Cr(CO)4dpp (chromium tetracarbonyl 2,3-bis(2′-pyridyl)pyrazine) adsorbed on silver nanoparticles. Journal of Physical Chemistry B 109 (42) : 19657-19663. ScholarBank@NUS Repository.
Abstract: A transition metal carbonyl species, Cr(CO)4dpp, has been successfully attached to bare silver nanoparticles prepared by laser ablation of a metal foil in ethanol. Transmission electron microscopy (TEM) images have shown that at least a portion of the silver nanoparticles have been capped by the chromium species, and ligand shells corresponding to Cr(CO)4dpp multilayer adsorption onto the silver nanoparticles of 30-50 nm diameter have been observed. The detection of the strongest Raman-active vCO band of Cr(CO)4dpp at 2004 cm-1 revealed that the species has been adsorbed without decomposition. The time-of-flight secondary ion mass spectrometry (TOF-SIMS) signals recorded of the chromium-capped silver nanoparticles were also consistent with the nondecomposition adsorption process. Density functional calculations have been used to reproduce the Raman spectrum using Ag7+ as a model surface. A large binding energy of about 122 kJ/mol has also been computed between silver and nitrogen atoms thus lending support to Cr(CO)4dpp being chemisorbed onto the silver surface. © 2005 American Chemical Society.
Source Title: Journal of Physical Chemistry B
ISSN: 15206106
DOI: 10.1021/jp0536347
Appears in Collections:Staff Publications

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