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Snezhkova O, Bischoff F, He Y, et al. Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing. J Chem Phys. 2016;144(9):094702doi: 10.1063/1.4942121.
Snezhkova, O., Bischoff, F., He, Y., Wiengarten, A., Chaudhary, S., Johansson, N., Schulte, K., Knudsen, J., Barth, J. V., Seufert, K., Auwärter, W., & Schnadt, J. (2016). Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing. The Journal of chemical physics, 144(9), 094702. https://doi.org/10.1063/1.4942121
Snezhkova, Olesia, et al. "Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing." The Journal of chemical physics vol. 144,9 (2016): 094702. doi: https://doi.org/10.1063/1.4942121
Snezhkova O, Bischoff F, He Y, Wiengarten A, Chaudhary S, Johansson N, Schulte K, Knudsen J, Barth JV, Seufert K, Auwärter W, Schnadt J. Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing. J Chem Phys. 2016 Mar 07;144(9):094702. doi: 10.1063/1.4942121. PMID: 26957171.
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J Chem Phys. 2016 Mar 07;144(9):094702. doi: 10.1063/1.4942121.

Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing.

The Journal of chemical physics

Olesia Snezhkova, Felix Bischoff, Yuanqin He, Alissa Wiengarten, Shilpi Chaudhary, Niclas Johansson, Karina Schulte, Jan Knudsen, Johannes V Barth, Knud Seufert, Willi Auwärter, Joachim Schnadt

Affiliations

  1. Division of Synchrotron Radiation Research, Department of Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden.
  2. Physik Department E20, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
  3. MAX IV Laboratory, Lund University, P.O. Box 118, 221 00 Lund, Sweden.

PMID: 26957171 DOI: 10.1063/1.4942121

Abstract

We have examined the geometric and electronic structures of iron phthalocyanine assemblies on a Cu(111) surface at different sub- to mono-layer coverages and the changes induced by thermal annealing at temperatures between 250 and 320 °C by scanning tunneling microscopy, x-ray photoelectron spectroscopy, and x-ray absorption spectroscopy. The symmetry breaking observed in scanning tunneling microscopy images is found to be coverage dependent and to persist upon annealing. Further, we find that annealing to temperatures between 300 and 320 °C leads to both desorption of iron phthalocyanine molecules from the surface and their agglomeration. We see clear evidence of temperature-induced homocoupling reactions of the iron phthalocyanine molecules following dehydrogenation of their isoindole rings, similar to what has been observed for related tetrapyrroles on transition metal surfaces. Finally, spectroscopy indicates a modified substrate-adsorbate interaction upon annealing with a shortened bond distance. This finding could potentially explain a changed reactivity of Cu-supported iron phthalocyanine in comparison to that of the pristine compound.

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