Gold cluster

Gold cluster

Gold clusters in cluster chemistry are gold-derived materials that can either be discrete molecules or larger colloidal particles. Both types are describes as nanoparticles, with diameters of less than one micrometer.

Discrete gold clusters

Well-defined, molecular clusters are known, invariably containing organic ligands on their exteriors. Two examples are [Au6CP(C6H5)3)6] 2+ and [Au9(P(C6H5)3)8] 3+. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]

Colloidal clusters

Gold clusters can be obtained in colloid form. Such colloids often occur with a surface coating of alkanethiols or proteins. Such clusters can be used in immunohistochemical staining [Hainfeld, J. F.; Powell, R. D. "New Frontiers in Gold Labeling" The Journal of Histochemistry & Cytochemistry, 2000 ,Volume 48, pages 471–480, [http://www.histochem.org/archives/new%20frontiers%20gold%20labeling2000.pdf Online Article] ] . Evidence has been presented for the existence of hollow golden cages with the partial formula Aun- with n = 16 to 18. ["Evidence of Hollow Golden Cages" Bulusu, S.; Li, X.; Wang, L.-S.; Zeng, X. C. Proc. Natl. Acad. Sci. USA 2006, [http://dx.doi.org/10.1073/pnas.0600637103 Abstract] ] These cluster compounds with diameter of 5.5 angstrom are observed in the gas-phase after they have been generated by laser vaporization and can be observed in the gas phase by photoelectron spectroscopy.

gold metal nanoparticles (NPs) are characterized by an intense absorption in the visible region, which enhances the utility of these species for the development of completely optical devices. The wavelength of this surface plasmon resonance (SPR) band depends on the size and shape of the nanoparticles as well as their interactions with the surrounding medium. The presence of this band enhances the utility of gold nanoparticle as building blocks for devices for data storage, ultrafast switching, and gas sensors.

External links

* Carbon fullerenes now have metallic cousins, 'hollow golden cages' [http://www.physorg.com/news66932851.html Article at physorg.com]

References


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