Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.34: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
Evolution of metallophthalocyanine multilayers on Cu(111) during thermal treatment depends on the type of metal center — •Jie Xiao1, Min Chen1, Hans-Peter Steinrück1, and J. Michael Gottfried2 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, 91058 Erlangen, Egerlandstrasse 3, Germany — 2Fachbereich Chemie, Universität Marburg, 35032 Marburg, Hans-Meerwein-Strasse, Germany
Vapor deposited multilayer (> 20 ML) Co-phthalocyanine (CoPc) on Cu(111) behaves differently than other transition metal phthalocyanines (MPcs) with the same coverage, such as ZnPc, CuPc and NiPc, when the respective multilayers are heated to a temperature well above their multilayer desorption temperature. For CoPc, the residual coverage is about 6 monolayers after annealing to 650 K, compared to 1-2 monolayers for the other MPcs. This has been found by X-ray and ultraviolet photoemission measurements. Transition metal phthalocyanines, including CoPc, have been demonstrated to adopt a flat-lying orientation on metal substrates, at least at submonolayer and monolayer coverages. However, the residual layer after CoPc desorption shows a different UP spectrum than a directly deposited film of the same coverage, suggesting that the post-heating step causes a different molecular orientation. Possible origins of this effect, including partial reaction of the peripheral C-H bonds with the Cu substrate, will be discussed. Support by the DFG through SFB 583 and the Alexander-von-Humboldt Foundation is gratefully acknowledged.