Abstract
This paper describes the synthesis, characterization, reactivity, and electrochemistry of monolayer-protected clusters (MPCs) of palladium that are passivated by monolayers of hexanethiolate or dodecanethiolate ligands. The synthetic product is sensitive to the thiol:Pd ratio used in the reaction mixture: a 1:1 ratio or smaller ratio produces metallic Pd(0) clusters that are similar to analogously prepared Au MPCs, but much more ligand-rich, whereas ≥2:1 ratios yield a very different material that is either extremely small Pd(0) clusters or a form of Pd(II) alkanethiolate complex. The monolayers of the metallic Pd(0) MPCs that are synthesized using small thiol:Pd ratios can be modified by ligand place-exchange and coupling reactions. The electrochemistry of the Pd core and of electroactive labels attached to the alkanethiolate ligands was studied. Quantized double-layer core charging is seen but less clearly than with Au MPCs. The Pd nanoparticles were examined using NMR, FTIR, UV - vis, TEM, TGA, and elemental analysis.
Original language | English (US) |
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Pages (from-to) | 481-488 |
Number of pages | 8 |
Journal | Langmuir |
Volume | 17 |
Issue number | 2 |
DOIs | |
State | Published - Jan 23 2001 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Spectroscopy
- Electrochemistry