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)

Steinrück HP, Stark MW, Ditze S, Thomann M, Lungerich D, Jux N, Marbach H (2016)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Surface Science Elsevier

Publisher: Elsevier

Book Volume: 650

Pages Range: 255-262

DOI: 10.1016/j.susc.2015.11.024

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.

Authors with CRIS profile

Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II Michael Werner Stark Sonderforschungsbereich 953/3 Synthetische Kohlenstoffallotrope Stefanie Ditze Exzellenz-Cluster Engineering of Advanced Materials Michael Thomann Lehrstuhl für Chemische Reaktionstechnik Dominik Lungerich Lehrstuhl für Organische Chemie II Norbert Jux Interdisziplinäres Zentrum für Molekulare Materialien Hubertus Marbach Lehrstuhl für Experimentalphysik

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials

How to cite

APA:

Steinrück, H.-P., Stark, M.W., 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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