Structure and bonding of ordered organic monolayers of 1,3,5,7-cyclooctatetraene on the Si(001) surface: surface cycloaddition chemistry of an antiaromatic molecule

Article Abstract:

An examination of the structure and bonding of 1,3,5,7-cyclooctatetraene (COT) with the silicon(001) surface was performed to address the dearth of research on the bonding of organic molecules to silicon surfaces. Findings revealed that a spontaneous ordering of the COT molecules on Si(001) occurs at room temperature, with each molecule separated by 7.7 angstrom. Moreover, the COT molecules bond to Si(001) through the direct interaction of two C=C units with two adjoining Si=Si dimers within an individual dimer row. Lastly, the lowest-energy geometry bonding of two C=C groups with two S=S dimers is a di-sigma configuration through a double [2+2] cycloaddition.

Organic compounds, Monomolecular films, Aromatic compounds, Chemical bonds

---

Cycloaddition chemistry on silicon(OO1) surfaces: the adsorption of azo-tert-butane

Article Abstract:

X-ray photoelectron spectroscopy is used in studying the structure and bonding of azo-tert-butane (ATB) adsorbed on a Si(001) surface. It will be demonstrated that bonding of alkenes to Si(001) can be generalized for other unsaturated species. Adsorption onto a 130 K surface occurs with no bond cleavage although the formation of a completely ordered layer at room temperature is inhibited by slight cleavage of C-H bonds. Results indicate ATB bonds to the Si(001) surface through an interaction of the pi bond of the azo group with the pi bonds of Si-Si dimers. This results in the formation of two new Si-N sigma bonds.

Adsorption, Azo compounds

---

Cycloaddition chemistry of 1,3-dienes on the silicon(001) surface: competition between (4+2) and (2+2) reactions

Article Abstract:

A study was conducted to analyze the reactions of 1,3-dienes with the Si(100) surface by scanning tunneling microscopy and Fourier transform infrared spectroscopy. The Si(001) samples were made by flash annealing pieces of Si(001) wafers at 1475 K with a camber pressure of 3x10(super -10) Torr. A multiple internal reflection geometry was utilized to determine the Fourier transform infrared spectra. Results indicated that the facile alkene reactions on Si(001) correlated with formation of a three-membered ring.

Research, Usage, Surfaces (Materials), Scanning tunneling microscopy, Fourier transform infrared spectroscopy, Surfaces (Technology)

Similar abstracts:

• Abstracts: Reversible activation of diblock copolymer monolayers at the interface by pH modulation, 1: Lateral chain density and conformation
• Abstracts: Bonding and motional aspects of CO adsorbed on the surface of Pt nanoparticles decorated with Pd. On the formation of silver carbonyl clusters in CO droplets
• Abstracts: Infrared study of the effect of hydration on the amide I band and aggregation properties of helical peptides. On the temperature dependence of amide I frequencies of peptides in solution
• Abstracts: Carbon-carbon bond activation in adsorbed cyclopropane by gas-phase atomic hydrogen on the Ni(111) surface. Gas-phase atomic hydrogen induced carbon-carbon bond activation in cyclopropnae on the Pt(111) surface
• Abstracts: Changing reactivity of a bimetallic surface via oxidation: reactions of methanol on oxygen-covered Co thin films

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.