有機π配位子による金ナノ粒子の機能化とネットワーク化

概要

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Thiol-derivatized gold nanoparticles has drawn much attention as a building block of nano-scaled electronic devises. As a fuctional thiol ligand, π-conjugated radical thiols, e.g p-mercaptophenyl nitronyl nitroxide, etc., have been synthesized. Nanoparitcles with the average particle size of 4 nm were chemisorbed by 100 lignads of p-mercaptophenyl nitronyl nitroxde and they were isolated and characterized. The ESR spectral peak width of the radical thiol on the nanoparticle was extremely broadened (ΔHpp= 30 mT at RT), suggesting the significant magnetic interaction between an unpaired electron of the radical uint and conduction electrons of gold nanoparticles. Network structures of gold nanopartilces connected by σ- or π-molecular nanowires made of alkanedithiol or oligothiophene with protected thiol groups were also prepared. It is to be noted that the network structures of nanaoparticles connected with molecular wires were prepared through a self-organization process. They are semiconductors with small activation energies (ca. 20 meV at temperatures higher than 40 K, and ca. 6 meV at lower than 40 K), suggesting a hopping mechanism for the electronic transportation in a higher temperatures region (T = 40 K) and a tunneling mechanism in the lower temperature (T < 40 K).
社団法人有機合成化学協会の論文
2004-05-01