Scanning tunneling microscopy studies of pulse deposition of dinuclear organometallic molecules on Au(111)

The Journal of Chemical Physics
Song Guo, S Alex Kandel

Abstract

Ultrahigh-vacuum scanning tunneling microscopy (STM) was used to study trans-[Cl(dppe)2Ru(C Triple Bond C)6Ru(dppe)2Cl] [abbreviated as Ru2, diphenylphosphinoethane (dppe)] on Au(111). This large organometallic molecule was pulse deposited onto the Au(111) surface under ultrahigh-vacuum (UHV) conditions. UHV STM studies on the prepared sample were carried out at room temperature and 77 K in order to probe molecular adsorption and to characterize the surface produced by the pulse deposition process. Isolated Ru2 molecules were successfully imaged by STM at room temperature; however, STM images were degraded by mobile toluene solvent molecules that remain on the surface after the deposition. Cooling the sample to 77 K allows the solvent molecules to be observed directly using STM, and under these conditions, toluene forms organized striped domains with regular domain boundaries and a lattice characterized by 5.3 and 2.7 A intermolecular distances. When methylene chloride is used as the solvent, it forms analogous domains on the surface at 77 K. Mild annealing under vacuum causes most toluene molecules to desorb from the surface; however, this annealing process may lead to thermal degradation of Ru2 molecules. Although pulse depos...Continue Reading

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Oct 27, 2006·The Journal of Physical Chemistry. B·Zhongqing WeiS Alex Kandel

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Citations

Oct 10, 2015·The Journal of Chemical Physics·Boris TsukerblatEugenio Coronado
Apr 5, 2013·Physical Chemistry Chemical Physics : PCCP·Rebecca C QuardokusS Alex Kandel
Jul 25, 2014·Chemical Communications : Chem Comm·Rebecca C QuardokusS Alex Kandel

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Methods Mentioned

BETA
scanning tunneling microscopy

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