Reversible thermally induced phase transition in ordered domains of Co(II)-5,10,15,20-tetrakis-(3,5-di-tert-butylphenyl)-porphyrin on Cu(111)

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(Originalarbeit)


Details zur Publikation

Autor(en): Steinrück HP, Stark M, Ditze S, Thomann M, Lungerich D, Jux N, Marbach H
Zeitschrift: Surface Science
Verlag: Elsevier
Jahr der Veröffentlichung: 2016
Band: 650
Seitenbereich: 255-262
ISSN: 0039-6028


Abstract


We investigated the adsorption behavior of Co(II)-5,10,15,20-tetrakis-(3,5-di-tert-butylphenyl)-porphyrin (CoTTBPP) on Cu(111) by scanning tunneling microscopy (STM). At room temperature (RT), the coverage dependent adsorption behavior follows an expected scheme: at low coverage step decoration is found, which evolves into supramolecular domains with a hexagonal order at higher coverage. Interestingly, upon cooling the sample to 180 K the occurrence of a clearly distinguishable coexisting herringbone phase is observed. Upon heating to RT again, the herringbone phase vanishes. Thus a temperature dependent, fully reversible phase transition was observed. High resolution STM micrographs allow for the determination of the intramolecular conformations which are different for the two supramolecular arrangements. In addition, we studied the bias voltage dependent appearance of the molecule in STM and assigned a dominant contribution of the central Co at negative bias voltages close to the Fermi edge to the occupied d orbital. Interestingly, the herringbone phase, which dominates at 180 K, exhibits a significantly higher molecular density than the monomodal hexagonal arrangement at RT, which is in line with the "normal" behavior of freezing substances.



FAU-Autoren / FAU-Herausgeber

Ditze, Stefanie Dr.
Exzellenz-Cluster Engineering of Advanced Materials
Jux, Norbert Prof. Dr.
Interdisziplinäres Zentrum für Molekulare Materialien
Lungerich, Dominik
Lehrstuhl für Organische Chemie II
Marbach, Hubertus PD Dr.
Lehrstuhl für Experimentalphysik
Stark, Michael
Sonderforschungsbereich 953/2 Synthetische Kohlenstoffallotrope
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Thomann, Michael
Lehrstuhl für Chemische Reaktionstechnik


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Steinrück, H.-P., Stark, M., Ditze, S., Thomann, M., Lungerich, D., Jux, N., & Marbach, H. (2016). Reversible thermally induced phase transition in ordered domains of Co(II)-5,10,15,20-tetrakis-(3,5-di-tert-butylphenyl)-porphyrin on Cu(111). Surface Science, 650, 255-262. https://dx.doi.org/10.1016/j.susc.2015.11.024

MLA:
Steinrück, Hans-Peter, et al. "Reversible thermally induced phase transition in ordered domains of Co(II)-5,10,15,20-tetrakis-(3,5-di-tert-butylphenyl)-porphyrin on Cu(111)." Surface Science 650 (2016): 255-262.

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Zuletzt aktualisiert 2018-05-10 um 21:50