Stereoselectivity and electrostatics in charge-transfer Mn- and Cs-TCNQ4 networks on Ag(100)

Nasiba Abdurakhmanova, Andrea Floris (), Tzu-Chun Tseng, Alessio Comisso, Sebastian Stepanow (), Alessandro De Vita and Klaus Kern
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Nasiba Abdurakhmanova: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1
Andrea Floris: King's College London, Strand London WC2R 2LS, UK.
Tzu-Chun Tseng: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1
Alessio Comisso: King's College London, Strand London WC2R 2LS, UK.
Sebastian Stepanow: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1
Alessandro De Vita: King's College London, Strand London WC2R 2LS, UK.
Klaus Kern: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Controlling supramolecular self-assembly is a fundamental step towards molecular nanofabrication, which involves a formidable reverse engineering problem. It is known that a variety of structures are efficiently obtained by assembling appropriate organic molecules and transition metal atoms on well-defined substrates. Here we show that alkali atoms bring in new functionalities compared with transition metal atoms because of the interplay of local chemical bonding and long-range forces. Using atomic-resolution microscopy and theoretical modelling, we investigate the assembly of alkali (Cs) and transition metals (Mn) co-adsorbed with 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules, forming chiral superstructures on Ag(100). Whereas Mn-TCNQ4 domains are achiral, Cs-TCNQ4 forms chiral islands. The specific behaviour is traced back to the different nature of the Cs- and Mn-TCNQ bonding, opening a novel route for the chiral design of supramolecular architectures. Moreover, alkali atoms provide a means to modify the adlayer electrostatic properties, which is important for the design of metal–organic interfaces.

Date: 2012
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DOI: 10.1038/ncomms1942

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