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Molecular Aggregation within Self‐Ordered Monolayers
Author(s) -
Gross Leo,
Rieder KarlHeinz,
Gourdon André,
Joachim Christian,
Moresco Francesca
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200600587
Subject(s) - monolayer , scanning tunneling microscope , intermolecular force , molecule , quantum tunnelling , self assembly , chemical physics , crystallography , scanning tunneling spectroscopy , chemistry , spectroscopy , materials science , nanotechnology , organic chemistry , optoelectronics , physics , quantum mechanics
The monolayer growth of pyrimido‐pentaphenylbenzene (NPB) on Cu(111) is investigated by means of low‐temperature scanning tunneling microscopy (LT‐STM). The pyrimidine side group gives rise to a pronounced resonant tunneling state and, furthermore, affects molecular self‐ordering. Different molecular aggregates are formed inside the hexagonal closed packed monolayer. A structure model for the monolayer is proposed and the temperature dependence of this self‐ordering process is investigated by varying the preparation temperature between 270 and 370 K. The intermolecular bonding of the aggregates is demonstrated by STM manipulation experiments. Moreover, different aggregations of the molecules induce characteristic energy shifts in the resonant tunneling state, as revealed by means of scanning tunneling spectroscopy.