Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Metal Substrates: Adsorption II
O 41.2: Vortrag
Mittwoch, 28. März 2007, 16:00–16:15, H39
Different assemblies of a phthalocyanine derivative on metal surfaces — •Tomas Samuely1, Meike Stöhr1, Thomas Jung2, Marco Haas3, Shi-Xia Liu3, and Silvio Decurtins3 — 1Institut für Physik,Universität Basel, Schweiz — 2Paul Scherrer Institut, Villigen, Schweiz — 3Departement für Chemie und Biochemie, Universität Bern, Schweiz
Phthalocyanines have been the subject of intense studies due to their wide range of optical, structural and electronic properties arising from their large π-conjugated system and their assembling into co facially-stacked arrays. We studied a phthalocyanine derivative which features eight ditertiarybutylphenyl substituents attached over an oxygen atom to the peripheral phenyl rings. Ordered assemblies of the derivative were prepared by thermal evaporation, whereas Ag(111) and Au(111) were used as substrates, respectively. The investigations were carried out by means of STM at various temperatures. For coverage less than one monolayer, two different assemblies were observed. At room temperature, a mobile phase was detected next to the ordered islands. Increasing the coverage results in only one ordered phase, while the second layer begins to form before a full monolayer is completed. Applying different bias voltages had a vast effect on the appearance of the imaged molecules. The assembled domains of the derivative could be suitable for subsequent deposition of various molecules: complexes with interesting magnetic, electronic, redox or photo-active properties could be formed.