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Ni K- and Au L3-edge XAFS of [Au6Ni32(CO)44]6- and a study of its transformations in acetonitrile solutions

Belyakova, O A and Kubozono, Y and Kashino, S and Slovokhotov, Yu L (2005) Ni K- and Au L3-edge XAFS of [Au6Ni32(CO)44]6- and a study of its transformations in acetonitrile solutions. Physica Scripta, T115 . pp. 705-708.

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Official URL: http://stacks.iop.org/1402-4896/T115/705

Abstract

Oxidation of the [Au6Ni32(CO)44]6− cluster anion in acetonitrile solutions by air and by Me3NO has been monitored using Ni K- and Au LIII-edge XAFS spectroscopy. EXAFS data for the pristine cluster correspond reasonably well to its known crystal structure and point to a formation of bimetallic Ni-Au nanoparticles in the oxidation products. Air oxidation of the acetonitrile solutions without additional oxidants/promoters goes very slowly whereas addition of Me3NO results in immediate precipitation. The nanoparticles formed upon the oxidation are suggested to have a core of gold atoms and an outer shell of nickel oxide.

Item Type:Article
ID Code:5475
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:11
Last Modified:06 Feb 2010 11:53

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