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

Abdurakhmanova, Nasiba and Floris, Andrea and Tseng, Tzu-Chun and Comisso, Alessio and Stepanow, Sebastian and De Vita, Alessandro and Kern, Klaus (2012) Stereoselectivity and electrostatics in charge-transfer Mn- and Cs-TCNQ4 networks on Ag(100). Nature Communications, 3 . p. 940. ISSN 2041-1723

Full content URL: http://dx.doi.org/10.1038/ncomms1942

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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.

Keywords:Self-assembly
Subjects:F Physical Sciences > F321 Solid state Physics
Divisions:College of Science > School of Mathematics and Physics
ID Code:22794
Deposited On:06 Jun 2016 21:04

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