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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
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Self-assembled monolayers based on Pd-containing organometallic thiols: preparation and structural characterization
Rosa Vitaliano1, Ilaria Fratoddi, Iole Venditti
1Department of Chemistry, University of Rome La Sapienza P. le A. Moro, 5- 00185, Rome, Italy.
The Journal of Physical Chemistry. A
|August 14, 2009
Summary
Organometallic thiolates form ordered layers on gold surfaces. Techniques like X-ray photoelectron spectroscopy reveal their surface interactions and molecular orientation, crucial for advanced materials development.
Area of Science:
- Materials Science
- Surface Chemistry
- Organometallic Chemistry
Background:
- Organometallic thiolates offer tunable electronic and structural properties.
- Self-assembled monolayers (SAMs) on gold are fundamental in nanotechnology and surface science.
- Understanding interfacial interactions is key to designing functional nanomaterials.
Purpose of the Study:
- To synthesize and deposit novel organometallic thiolates onto gold surfaces.
- To characterize the interfacial properties, molecular orientation, and packing density of these organometallic layers.
- To investigate the anchoring behavior and interactions at the organometallic-gold interface.
Main Methods:
- Deposition of organometallic thiolates (trans-[Pd(PBu(3))(2)(SCOCH(3))(2)], trans-[(C(6)H(5)C[triple bond]C)Pd(PBu(3))(2)(SCOCH(3))], and trans,trans-[(CH(3)COS)Pd(PBu(3))(2)(C[triple bond]C-C(6)H(4)-C(6)H(4)-C[triple bond]C)(PBu(3))(2)Pd(SCOCH(3))]) onto gold substrates.
- High-resolution X-ray photoelectron spectroscopy (HRXPS) for elemental analysis and chemical state determination.
- Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for molecular orientation and electronic structure analysis.
Main Results:
- Successful deposition of multilayer and self-assembled monolayers of organometallic thiolates on gold.
- HRXPS and NEXAFS confirmed the anchoring of thiolates to the gold surface via sulfur-gold bonds.
- Determined molecular orientation with tilt angles ranging from 30 to 40 degrees, dependent on molecular structure.
- Assessed molecule packing density and surface coverage, providing insights into layer formation.
Conclusions:
- Organometallic thiolates can form well-defined structures on gold surfaces.
- The molecular structure significantly influences orientation and packing density.
- These findings are vital for designing functional surfaces and interfaces in electronic and catalytic applications.
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02:33Preparation and Reactions of Thiols
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
02:26Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.