Donald Bethell

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This Letter demonstrates the design and synthesis of functional nanoparticles based on the assembly of terminally substituted alkanethiols on the surface of colloidal gold. The colloids were modified with alkanethiolates presenting methyl groups and dihydroquinidine ligands (in a ratio of 3:1) for the Sharpless asymmetric dihydroxylation of olefins.(More)
So-called bottom-up fabrication methods aim to assemble and integrate molecular components exhibiting specific functions into electronic devices that are orders of magnitude smaller than can be fabricated by lithographic techniques. Fundamental to the success of the bottom-up approach is the ability to control electron transport across molecular components.(More)
Isolable, water-soluble gold clusters protected by monolayers of tiopronin (tiopronin-MPCs) or coenzyme A (CoA-MPCs) were synthesized by a procedure of comparable simplicity to the Brust synthesis for alkanethiolate monolayer-protected gold clusters. High-resolution transmission electron microscopy shows that, like their alkanethiolate-MPC counterparts, the(More)
Nanometer-sized gold clusters stabilized by monolayers of arenethiolates prepared using the Brust reaction are somewhat larger (by TEM) and less thermally stable (by TGA) than those prepared under similar conditions and stabilized by alkanethiolates. Like the latter, the mean core size decreases for synthetic conditions based on larger thiol/Au ratios. The(More)
Research efforts in organized assemblies of nanosized particle materials have been intensified lately, in part, due to their application potentialities as the building blocks for electronic nanodevices/nanocircuits. 1-9 Among these, monolayer-protected nanoclusters (MPCs) 10 have attracted particular attention thanks to the (sub)attofarad(More)
National Laboratory for providing CdSe nanocrystals and useful discussions. T. Rieker, NSF (formerly University of New Mexico), performed early XRD experiments. Climate policy decisions are being made despite layers of uncertainty. Such decisions directly influence the potential for " dangerous anthropogenic interference with the climate system. " We mapped(More)
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