Abstract

The three-dimensional growth of para-sexiphenyl (p-6P) on KCl(001) is characterized by a large polymorphism. Using grazing-incidence diffraction, we have found that two of the known five orientational phases feature preferential in-plane alignments along the [110] in-plane direction of the substrate: p-6P(11−1) ∥ KCl(001) with [1−10] ∥ KCl[110] as well as p-6P(001) ∥ KCl(001) with [1−10] ∥ KCl[110]. The latter structure is a peculiar low-symmetry configuration, which can be understood by analysis of the molecular crystal lattice and the substrate symmetry.

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