Swiss Phthalocyanine Theses

6 entries; January 25, 2004

1968

CODE: 1968CH001
AU-EN: Gawad el-Hussamy, Mohamed SamirAbel
PY: 1968
TI: The synthesis of tetrophtaloyl-phthalocyanine dyestuffs
UNI: Zuerich Techn. Hochsch.

1988

CODE: 1988CH001
AU-EN: Hunziker, W.
PY: 1988
TY: Doktorarbeit
LA: German
TI: Untersuchung elektrischer und photoelektrischer Eigenschaften an Vanadyl-Phytalocyanin-Duenschichten mit Anwendungen
UNI: Zuerich Technische Hochsch.

1993

CODE: 1993CH001
AU-EN: Isele, U.
PY: 1993
TI: Phospholipids as solubilizers for water-insoluble drugs
UNI: Basel Univ.

2002

CODE: 2002CH003
AU-EN: DE WILD, Michael
PY: 2002
TI: Novel principle for 2D molecular self-assembly: self-intermixed monolayer phases of sub-phthalocyanine and C60 on Ag(111)
UNI: University of Basel, Switzerland
URL: Fulltext

CODE: 2002CH002
AU-EN: BERNER, Simon
PY: 2002
TI: Molecular Diffusion and Self-Organization on Metal Surfaces: Sub-Phthalocyanine on Ag(111)
UNI: University of Basel, Switzerland
ABST: The adsorption and layering of chloro[subphthalocyaninato]boron(III) (SubPc) on Ag(111) has been studied in detail by means of Scanning Tunneling Microscopy (STM) and photoelectron spectroscopy at room temperature. SubPc is a polar molecule with an aromatic 14-pi-electron system. An interesting phase behavior is observed for the first molecular layer of SubPc growing on Ag(111). At a coverage below _ 0:2 monolayer (ML), only a two-dimensional (2D) lattice gas is present, whereas at a coverage in the order of 0.2{0.5 ML} two-dimensional condensed molecular islands are in coexistence with the 2D lattice gas. In these condensed islands, the molecules self-organize into well ordered overlayers with a honeycomb pattern which has a low packing density. At a coverage of 0.6{0.9 ML} the molecules self-organize into a 2D hexagonal close packed (hcp) pattern. This hcp pattern is observed in coexistence with a dense 2D gas phase. For the honeycomb and the hcp pattern, individual molecules are imaged with sub-molecular resolution. Typically the molecules are imaged as characteristic three lobes. The coexistence of the honeycomb pattern with the 2D lattice gas is studied in detail. A dynamic equilibrium of the condensed honeycomb phase with its gas phase by exchange of molecules is observed. The energy barrier for surface diffusion as well as the condensation energy to form 2D islands is estimated and discussed. Interesting and unusual features of the ordered molecular overlayers are observed. For each pattern, the honeycomb and the hcp, only two different orientations with respect to the Ag(111) substrate exist. For the honeycomb pattern, the two different orientations have different chirality, although the SubPc molecule itself is achiral. Not only single SubPc molecules show diffusion but also whole ordered islands exhibit mobility. This becomes evident in the observed flipping process of overlayers, where whole condensed islands change their orientation between the two stable orientations of the pattern. In the case of the honeycomb pattern, this constitutes a transition between the two chiral layers. Phase transitions from the gas phase to the condensed hcp phase and vice versa of whole overlayer islands could be controlled by the STM tip. In vacancy islands of the Ag(111) surface produced by sputter defects, it is possible to reversible change the phase of the conned molecular overlayer by tip induced experiments. The two phases, the hcp phase and the gas phase, exist at the same conditions at room temperature. Therefore one of these two phases is thermodynamically not favored and in a metastable state. A microscopic model based on the electric eld between tip and sample is proposed for this tip-controlled phase transition. In addition to the STM experiments the adsorption geometry and the electronic structure of SubPc on Ag(111) is studied by means of photoelectron spectroscopy. It is observed that the intact SubPc molecule is mainly physisorbed on the Ag(111) with the Cl towards the Ag surface. The pi-electron system of the molecule undergoes only slight changes upon adsorption on the Ag surface. In general, the observed features of the molecular overlayers are attributed to the charge distribution of SubPc and to its resulting dipole moment.
URL: Fulltext

CODE: 2002CH001
AU-EN: NEZEL, Thomas
TY: Dr.sc.nat.
PY: 2002
TI: Investigation and development of selective polymeric liquid membranes for the optical detection of nitrite with chemical sensors
UNI: Eidgenoessische Technische Hochschule Zuerich, Switzerland

http://www.unibas.ch/diss/2002/DissB_6273.htm Please also check the theses where the university and/or the year is unknown. If you have additional data about these, please tell me. Only with your help, this project will advance.

Dr. Michael Klaus Engel

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