Browsing by Author "Reichert, Joachim"

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Citation - WoS: 50
Citation - Scopus: 54
Synthesis of Pyrene-Fused Pyrazaacenes on Metal Surfaces: Toward One-Dimensional Conjugated Nanostructures
(Amer Chemical Soc, 2016) Jiang, Li; Papageorgiou, Anthoula C.; Oh, Seung Cheol; Sağlam, Özge; Reichert, Joachim; Duncan, David A.; Zhang, Yi-Qi
We investigated the synthesis of one-dimensional nanostructures via Schiff base (imine) formation on three close-packed coinage metal (Au, Ag, and Cu) surfaces under ultrahigh vacuum conditions. We demonstrate the feasibility of forming pyrene-fused pyrazaacene-based oligomers on the Ag(111) surface by thermal annealing of tetraketone and tetraamine molecules, which were designed to afford cyclocondensation products. Direct visualization by scanning tunneling microscopy of reactants, intermediates, and products with submolecular resolution and the analysis' of their statistical distribution in dependence of stoichiometry and annealing temperature together with the inspection of complementary X-ray photoelectron spectroscopy signatures provide unique insight in the reaction mechanism, its limitations, and the role of the supporting substrate. In contrast to the reaction on Ag(111), the reactants desorb from the Au(111) surface before reacting, whereas they decompose on the Cu(111) Surface during the relevant thermal treatment.
Citation - WoS: 12
Tuning the Ease of Formation of On-Surface Metal-Adatom Coordination Polymers Featuring Diketones
(Royal Soc Chemistry, 2018) Papageorgiou, Anthoula C.; Li, Jiang; Oh, Seung Cheol; Zhang, Bodong; Sağlam, Özge; Guo, Yuanyuan; Reichert, Joachim
We use pyrene-4,5,9,10-tetraketone molecules with substituents of varying bulkiness in the 2,7 positions to probe the generality and versatility of the previously reported on-surface coordination of two diketones with a single metal atom, leading to one-dimensional coordination polymers. Three different low index surfaces of group 11 metals (Cu, Ag and Au) are used to provide both the support and the metal atoms for metal-organic coordination. By real space visualisation with single molecule resolution employing scanning tunnelling microscopy we investigate the molecular self-assembly and show how this can be substantiated with the formation of metal-organic linear and cyclic oligomers, depending on the employed substrate.