Università
Cattolica del Sacro Cuore – Sede di Brescia
Structure
and reactivity
of
phthalocyanine- and porphyrin-containing
self-assembled networks on silver substrates
Prof. Mauro SAMBI
ABSTRACT
A
fine control of the interfacial structure between organic molecular layers and
the underlying substrate is critical for a reproducible set-up of the desired
functional properties of the organic component in surface-supported functional
devices. Whether molecular precursors such as Phthalocyanines
(Pcs) and Porphyrins (Pps) are investigated for their electronic, optical and
magnetic properties – for possible applications in fields such as sensing,
catalysis, light-to-energy conversion, molecular electronics, non-linear optics
or spintronics – in all cases their precise matching
with the substrate at the atomic level can have profound consequences both on
their subsequent organization at the supramolecular
level and on the modulation of their single-molecule properties.
This
talk will address some aspects of the relationship between structure and
reactivity in two surface-supported two-dimensional systems based on Pcs and Pps, studied by means of
surface science (primarily STM) and computational chemistry tools. More specifically,
the following topics will be briefly
discussed:
(a)
the dependence of the
catalytic activity toward oxygen reduction of an Ag(110)-supported iron Pc (FePc) monolayer on the supramolecular
arrangement of FePc molecules [1];
(b) the covalent bond stabilization of bicomponent
supramolecular networks of C60 and
variously aminated tetra-phenyl-Pps
on Ag low-index surfaces [2, 3].
[1]
M. Casarin, M. Di Marino, D. Forrer,
M. Sambi, F. Sedona, E. Tondello
A. Vittadini, V. Barone and M. Pavone:
“Coverage-dependent architectures of Iron Phthalocyanine
on Ag(110): a comprehensive STM/DFT study”, J. Phys. Chem. C 114 (2010)
2144-2153.
[2]
M. Di Marino, F. Sedona, M. Sambi, T. Carofiglio, E. Lubian, M. Casarin, and E. Tondello: “An STM
investigation of Temperature-dependent 2D Supramolecular
Architectures of C60 and Amino-tetraphenylporphyrin
on Ag (110)”, Langmuir 26 (2010) 2466-2472.
[3]
F. Sedona, M. Di Marino, M. Sambi, T. Carofiglio, E. Lubian, M. Casarin, and E. Tondello:
“Fullerene/porphyrin multicomponent
nanostructures on Ag(110): from supramolecolar
self-assembly to extended copolymers”, ACS Nano 4
(2010) 5147-5154.