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Issue 20, 2011
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Structure, morphology and interface properties of ultrathin SnTTBPP(OH)2-films adsorbed on Ag(100)

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Abstract

The molecular interaction of dihydroxo[5,10,15,20-tetrakis(4-tert-butyl-phenyl)porphyrinato]-tin(IV) (SnTTBPP(OH)2), the structural order and growth of ultrathin films on Ag(100) have been studied by means of low-energy electron diffraction (LEED) and synchrotron based photoelectron spectroscopy, i.e., X-ray photoemission (XPS) and near-edge X-ray absorption fine structure (NEXAFS/XANES) spectroscopy. For the first time, monolayer adsorption of a metalloporphyrin with octahedral coordination of the metal center by two additional axial hydroxo ligands is investigated in a multi-technique study. The delicate balance of molecule–substrate interactions and intermolecular interactions leads to the formation of a densely-packed organic monolayer which is commensurate with the Ag(100) substrate. From NEXAFS linear dichroism an almost coplanar orientation of the porphyrin system is derived. XPS and NEXAFS clearly indicate that the axial hydroxo ligands are cleaved in monolayer films, i.e., upon adsorption to the Ag substrate. With increasing film thickness orientational order gets lost and leads to polycrystalline growth for thicker films as confirmed by scanning X-ray transmission microscopy (STXM).

Graphical abstract: Structure, morphology and interface properties of ultrathin SnTTBPP(OH)2-films adsorbed on Ag(100)

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Article information


Submitted
09 Feb 2011
Accepted
24 Mar 2011
First published
18 Apr 2011

Phys. Chem. Chem. Phys., 2011,13, 9839-9848
Article type
Paper

Structure, morphology and interface properties of ultrathin SnTTBPP(OH)2-films adsorbed on Ag(100)

N. Schmidt, C. Hub, J.-F. Gnichwitz, W. Hieringer, A. Hirsch and R. H. Fink, Phys. Chem. Chem. Phys., 2011, 13, 9839
DOI: 10.1039/C1CP20340A

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