2 research outputs found
Formation of Hybrid Electronic States in FePc Chains Mediated by the Au(110) Surface
Iron–phthalocyanine (FePc) molecules deposited
on the Au(110)
surface self-organize in ordered chains driven by the reconstructed
Au channels. The interaction process induces a rehybridization of
the electronic states localized on the central metal atom, breaking
the 4-fold symmetry of the molecular orbitals of the FePc molecules.
The molecular adsorption is controlled by a symmetry-determined mixing
between the electronic states of the Fe metal center and of the Au
substrate, as deduced by photoemission and absorption spectroscopy
exploiting light polarization. DFT calculations rationalize this mixing
of the Fe and Au states on the basis of symmetry arguments. The calculated
electronic structure reproduces the main experimental spectral features,
which are associated to a distorted molecular structure displaying
a trigonal bipyramidal geometry of the ligands around the metal center
Adsorption and Dissociation of <i>R</i>‑Methyl <i>p</i>‑Tolyl Sulfoxide on Au(111)
Sulfur-based molecules producing self-assembled monolayers
on gold
surfaces have long since become relevant functional molecular materials
with many applications in biosensing, electronics, and nanotechnology.
Among the various sulfur-containing molecules, the possibility to
anchor a chiral sulfoxide to a metal surface has been scarcely investigated,
despite this class of molecules being of great importance as ligands
and catalysts. In this work, (R)-(+)-methyl p-tolyl sulfoxide was deposited on Au(111) and investigated
by means of photoelectron spectroscopy and density functional theory
calculations. The interaction with Au(111) leads to a partial dissociation
of the adsorbate due to S–CH3 bond cleavage. The
observed kinetics support the hypotheses that (R)-(+)-methyl p-tolyl sulfoxide adsorbs on Au(111) in two different adsorption
arrangements endowed with different adsorption and reaction activation
energies. The kinetic parameters related to the adsorption/desorption
and reaction of the molecule on the Au(111) surface have been estimated