Ruthenium(II) trispyridine functionalized gold nanorods. Morphological changes and excited-state interactions

Jebb, M., Sudeep, P.K., Pramod, P., Thomas, K. George and Kamat, P.V.

J. Phys. Chem. B 111(24), 6839-6844 (2007)

NDRL 4709

Gold nanorods synthesized using cetyltrimethylammonium bromide and tetraoctylammonium bromide as stabilizers are functionalized with a thiol derivative of ruthenium(II) trisbipyridyl complex [(Ru(bpy)32+-C5-SH] in dodecanethiol using a place-exchange reaction. The changes in the plasmon absorption bands and transmission electron micrographs indicate significant changes in the gold rod morphology during the place-exchange reaction. The (Ru(bpy)32+-C5-SH in its excited state undergoes quick deactivation when bound to gold nanorods. More than 60% of the emission was quenched when [(Ru(bpy)32+-C5-SH] was bound to gold nanorods. Emission decay analysis indicates that the energy transfer rate constant is greater than 1010 s-1.