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On-Surface Polymerization of 1,6-Dibromo-3,8-diiodpyrene-A Comparative Study on Au(111) Versus Ag(111) by STM, XPS, and NEXAFS
Tech Univ Munich, Germany; Deutsch Museum, Germany.
Tech Univ Munich, Germany; Deutsch Museum, Germany.
Tech Univ Munich, Germany; Deutsch Museum, Germany.
Max Planck Inst Solid State Res, Germany; Marquette Univ, WI 53233 USA.
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2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 11, p. 5967-5977Article in journal (Refereed) Published
Abstract [en]

The surface chemistry of 1,6-dibromo-3,8-diiodopyrene (Br2I2Py) is comparatively studied on Au(111) versus Ag(111) surfaces under ultrahigh vacuum conditions by a combination of high-resolution scanning tunneling microscopy (STM) and X-ray spectroscopy. The chemical state of the molecular networks, that is, the dehalogenation and the possible formation of organometallic intermediates, is assessed by X-ray photoelectron spectroscopy. In addition, pyrene tilt angles are quantified by carbon K-edge near edge X-ray absorption fine structure experiments. Upon room-temperature (RT) deposition of Br2I2Py onto Au(111), only partial deiodination was found, and STM revealed the coexistence of ordered arrangements of both intact Br2I2Py molecules and organometallic dimers as well as few larger aggregates. Further annealing to 100 C triggered full deiodination followed by the formation of organometallic chains of otherwise still brominated molecules. By contrast, on Ag(111), iodine is fully and bromine is partly dissociated upon RT deposition of Br2I2Py. The initially disordered organometallic aggregates can be reorganized into more ordered structures by mild annealing at 125 degrees C. Yet, the conversion of the organometallic intermediates into well-defined cross-linked quasi 2D covalent networks was neither possible on Au(111) nor on Ag(111). This is attributed to the large steric hindrance in the covalently linked adsorbed state.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 122, no 11, p. 5967-5977
National Category
Inorganic Chemistry
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URN: urn:nbn:se:liu:diva-147413DOI: 10.1021/acs.jpcc.7b10403ISI: 000428356700016OAI: oai:DiVA.org:liu-147413DiVA, id: diva2:1206665
Note

Funding Agencies|The excellence cluster Nanosystems Initiative Munich; Max Planck Society

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17

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