Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Low Dimensional Systems: Other Topics

TT 19.4: Vortrag

Montag, 16. März 2020, 17:45–18:00, HSZ 103

1D coordination polymers on metal surfaces with distinct structures defined by the choice of the transition metal — •Vijai Meena Santhini, Christian Wackerlin, Ales Cahlik, Oleksander Stetsovych, Pingo Mutombo, and Pavel Jelinek — Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic

2,5-diamino-1,4-benzoquinonediimines (QDIs)belong to one of the most important classes of π-conjugated molecules and are particularly interesting because of the unusual distribution of their overall 12-π electrons system which can be described as two nearly-independent 6-π electrons subunits chemically connected through two C-C single bonds.

In this context, we explore here the reaction between transition metal atoms (Cr, Fe, Co, Ni and Cu) and QDI directly at the solvent-free solid-vacuum interface. The metals are introduced as neutral metal atoms from an electron-beam evaporator (all except Cu) or they are provided by the substrate (Cu). QDI is introduced by sublimation, and is let to react on Au(111) and Cu(111) surfaces with the metal atoms. . The {Cr, Fe, Co, Ni}-based wires are built from a four-fold rectangular-planar coordination motif while with Cu the wires are based on two-fold linear coordination motifs. The reaction products are characterized by combined scanning tunneling microscopy (STM) non-contact atomic force microscopy (nc-AFM) and N K near edge X-ray absorption fine structure (NEXAFS) spectroscopy.

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