From hydrogen bonding to metal coordination and back: Porphyrin-based networks on Ag(111)

The Journal of Chemical Physics
F StudenerMeike Stöhr

Abstract

The self-assembly of a metal-free porphyrin bearing two pyridyl coordinating sites and two pentyl chains at trans meso positions was investigated under ultrahigh vacuum on a Ag(111) surface by scanning tunneling microscopy (STM). The STM measurements revealed a well-ordered close-packed structure with a rhombic unit cell for coverages ≤1 monolayer with their molecular plane parallel to the surface. The growth direction of the molecular islands is aligned along the step edges, which are restructured due to molecule-substrate interactions. The shorter unit cell vector of the molecular superstructure follows the〈1-10〉direction of the Ag(111) substrate. Hydrogen bonds between pyridyl and pyrrole groups of neighboring molecules as well as weak van der Waals forces between the pentyl chains stabilize the superstructure. Deposition of cobalt atoms onto the close-packed structure at room temperature leads to the formation of a hexagonal porous network stabilized by metal-ligand bonding between the pyridyl ligands and the cobalt atoms. Thermal annealing of the Co-coordination network at temperatures >450 K results in the transformation of the hexagonal network into a second close-packed structure. Changes in the molecule-substrate inter...Continue Reading

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Citations

Dec 13, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Jingfei HouQingdao Zeng
Dec 17, 2015·Physical Chemistry Chemical Physics : PCCP·Bastien CalmettesRoland Coratger
Apr 28, 2018·Chemistry : a European Journal·Martin SchwarzWilli Auwärter
Mar 17, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kathrin MüllerMeike Stöhr
Jun 22, 2021·Chemistry : a European Journal·Brian D Baker CortésMeike Stöhr
Jul 3, 2019·The Journal of Physical Chemistry Letters·Xiaonan SunJean-Christophe Lacroix
Sep 22, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Lin MaQingdao Zeng

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