Square, hexagonal, and row phases of PTCDA and PTCDI on Ag-Si(111)square root of 3 x square root of 3 R30degree

Article Abstract:

The ordered phases of the perylene derivatives perylene-3,4,9,10-tetracarboxylic-3,4,9-10-dianhydride (PTCDA) and the imide analogue PTCDI on the Ag-Si(111)square root of 3 x square root of 3 R30 degree surface are investigated using scanning tunneling microscopy. The existence of a square phase on a hexagonal surface is a result of a near commensurability between the molecular dimensions and the surface lattice.

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Dianhydride-amine hydrogen bonded perylene tetracarboxylic dianhydride and tetraaminobenzene rows

Article Abstract:

The coadsorpium of perylene tetracarboxylic diahydride (PTCDA) and tetraaminobenzene (TAB) on the Ag/Si(111)-(square root of 3)x(square root of 3)R30 degree surface using scanning tunneling microscopy is investigated. It is confirmed that this hydrogen bonding junction is stable using ab initio calculations and it is shown that the proposed geometry is consistent with calculated intermolecular dimensions.

Electric properties

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Hydrogen-bonded PTCDA-melamine networks and mixed phases

Article Abstract:

The formation of intermixed phases of 3,4,9,10-perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA) and melamine is investigated. Deposition of melamine on a sample with a sub-monolayer coverage of PTCDA induces the formation of two stable intermixed molecular phases, completely different from phases formed by PTCDA alone.

Science & research, Research, Anhydrides, Melamine

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