title: Substituent-induced intermolecular interaction in organic crystals revealed by precise band-dispersion measurements.
abstract: We reveal quite small but different intermolecular valence band dispersions of sub-100-meV scale in crystalline films of Zn and Mn phthalocyanine (ZnPc and MnPc) and fluorinated ZnPc (F16ZnPc). The intermolecular transfer integrals are found to be reasonably dependent on the intermolecular distance with the 75±5 meV/Å relation. Furthermore, the angle-resolved photoemission spectra show anomalous dispersive behaviors such as phase flips and local-dimerization-derived periodicities, which originate from the site-specific intermolecular interaction induced by substituents.
authors.affiliation: Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamane
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Kosugi