CSIR – National Institute for Interdisciplinary Science and Technology (NIIST)

Council of Scientific & Industrial Research (CSIR), Govt.Of India Thiruvananthapuram.

Synthesis and characterization of gold nanoparticle -cored dendrimers stabilized by metal-carbon bonds

Synthesis of gold nanoparticle-cored dendrimers (NCDs), where the dendrons are attached to the gold core through gold-carbon bonds involved the simultaneous reduction of HAuCl4 and a Fréchet-type dendron with a diazonium group at the focal point, in an organic solvent such as toluene. These materials possessed a nanometer-sized gold core surrounded by a shell of polyaryl ether dendrons which are connected radially to the core. The NCDs were characterized by TEM, TGA, IR, UV and NMR techniques. Average particle diameter of the NCDs ranged from 4.7 to 5.5 nm for the different generations. All NCDs exhibited the characteristic plasmon absorption of gold nanoparticles at 520 nm. Average numbers of dendrons per NCD in AuGn were calculated using results from TGA and TEM studies. Multiple layering of the dendrons was proposed as possible reason for the high dendron / NCD value (Chem. Asian J. 2010, 5, 887-896).