Tetra-t-butyl magnesium phthalocyanine on gold: electronic structure and molecular orientation

I Biswas; H Peisert; T Schwieger; D Dini; M Hanack; M Knupfer; T Schmidt; T Chassé

doi:10.1063/1.1844300

Tetra-t-butyl magnesium phthalocyanine on gold: electronic structure and molecular orientation

J Chem Phys. 2005 Feb 8;122(6):064710. doi: 10.1063/1.1844300.

Authors

I Biswas¹, H Peisert, T Schwieger, D Dini, M Hanack, M Knupfer, T Schmidt, T Chassé

Affiliation

¹ Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany.

PMID: 15740399
DOI: 10.1063/1.1844300

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.