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

Abdurakhmanova, N.; Floris, A.; Tseng, T. C.; Comisso, A.; Stepanow, S.; De Vita, A.; Kern, K.

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

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Stepanow, S.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Kern, K.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Abdurakhmanova, N., Floris, A., Tseng, T. C., Comisso, A., Stepanow, S., De Vita, A., et al. (2012). Stereoselectivity and electrostatics in charge-transfer Mn- and Cs-TCNQ₄ networks on Ag(100). Nature Communications, 3: 940.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C381-3

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-TCNQ(4) domains are achiral, Cs-TCNQ(4) 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.