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

Snezhkova, Olesia LU ; Bischoff, Felix; He, Yuanqin; Wiengarten, Alissa; Chaudhary, Shilpi LU ; Johansson, Niclas LU ; Schulte, Karina LU ; Knudsen, Jan LU ; Barth, Johannes V and Seufert, Knud, et al. (2016) In Journal of Chemical Physics 144(9).
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... (More)
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. (Less)
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published
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Journal of Chemical Physics
volume
144
issue
9
publisher
American Institute of Physics
external identifiers
  • pmid:26957171
  • scopus:84959542182
  • wos:000372022800023
ISSN
0021-9606
DOI
10.1063/1.4942121
language
English
LU publication?
yes
id
99e353f5-2060-43a6-894f-a09cd7a5cce2 (old id 8852981)
date added to LUP
2016-03-23 13:45:27
date last changed
2017-01-29 03:12:04
@article{99e353f5-2060-43a6-894f-a09cd7a5cce2,
  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.},
  articleno    = {094702},
  author       = {Snezhkova, Olesia and Bischoff, Felix and He, Yuanqin and Wiengarten, Alissa and Chaudhary, Shilpi and Johansson, Niclas and Schulte, Karina and Knudsen, Jan and Barth, Johannes V and Seufert, Knud and Auwärter, Willi and Schnadt, Joachim},
  issn         = {0021-9606},
  language     = {eng},
  number       = {9},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing.},
  url          = {http://dx.doi.org/10.1063/1.4942121},
  volume       = {144},
  year         = {2016},
}