title: Tetra-t-butyl magnesium phthalocyanine on gold: electronic structure and molecular orientation.
abstract: In this work we have investigated the electronic structure and the molecular orientation of (t-Bu)(4)PcMg (tetra-t-butyl magnesium phthalocyanine) on polycrystalline and single crystalline gold substrates using photoemission spectroscopy and x-ray absorption spectroscopy, and we compare the results to the unsubstituted PcCu (copper phthalocyanine). The C 1s photoemission spectrum is described similar to unsubstituted relatives with an additional component for the aliphatic substituents. The variation of the excitation energy causes distinct differences in the shape of the C 1s spectrum, which is very useful for the analysis of the molecular orientation in the uppermost layer. It is shown that despite of the sterically demanding substituents, ordered sublimed films of (t-Bu)(4)PcMg are accessible, the orientation of the molecules, however, is different from the orientation of the unsubstituted relatives.
authors.affiliation: Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Biswas
authors.forename: H
authors.initials: H
authors.lastname: Peisert
authors.forename: T
authors.initials: T
authors.lastname: Schwieger
authors.forename: D
authors.initials: D
authors.lastname: Dini
authors.forename: M
authors.initials: M
authors.lastname: Hanack
authors.forename: M
authors.initials: M
authors.lastname: Knupfer
authors.forename: T
authors.initials: T
authors.lastname: Schmidt
authors.forename: T
authors.initials: T
authors.lastname: Chassé