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@ARTICLE{Stadtmller:280902,
author = {Stadtmüller, Benjamin and Schröder, Sonja and Kumpf,
Christian},
title = {{H}eteromolecular metal–organic interfaces: {E}lectronic
and structural fingerprints of chemical bonding},
journal = {Journal of electron spectroscopy and related phenomena},
volume = {204},
issn = {0368-2048},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2016-00613},
pages = {80 - 91},
year = {2015},
abstract = {Beside the fact that they attract highest interest in the
field of organic electronics, heteromolecular structures
adsorbed on metal surfaces, in particular donor–acceptor
blends, became a popular field in fundamental science,
possibly since some surprising and unexpected behaviors were
found for such systems. One is the apparent breaking of a
rather fundamental rule in chemistry, namely that stronger
chemical bonds go along with shorter bond lengths, as it is,
e.g., well-known for the sequence from single to triple
bonds. In this review we summarize the results of
heteromolecular monolayer structures adsorbed on Ag(1 1 1),
which – regarding this rule – behave in a
counterintuitive way. The charge acceptor moves away from
the substrate while its electronic structure indicates a
stronger chemical interaction, indicated by a shift of the
formerly lowest unoccupied molecular orbital toward higher
binding energies. The donor behaves in the opposite way, it
gives away charge, hence, electronically the bonding to the
surface becomes weaker, but at the same time it also
approaches the surface. It looks as if the concordant link
between electronic and geometric structure was broken. But
both effects can be explained by a substrate-mediated charge
transfer from the donor to the acceptor. The charge
reorganization going along with this transfer is responsible
for both, the lifting-up of the acceptor molecule and the
filling of its LUMO, and also for the reversed effects at
the donor molecules. In the end, both molecules mutually
enhance their respective donor and acceptor characters. We
argue that this effect is of general validity for
π-conjugated molecules adsorbing on noble metal surfaces.},
cin = {PGI-3 / JARA-FIT},
ddc = {620},
cid = {I:(DE-Juel1)PGI-3-20110106 / $I:(DE-82)080009_20140620$},
pnm = {141 - Controlling Electron Charge-Based Phenomena
(POF3-141)},
pid = {G:(DE-HGF)POF3-141},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000363078400011},
doi = {10.1016/j.elspec.2015.03.003},
url = {https://juser.fz-juelich.de/record/280902},
}