title: Self-assembled rows of Ni porphyrin dimers on the Ag(111) surface.
abstract: The growth and ordering of 5-(10,15,20-triphenylporphyrinatonickel(ii))dimer (NiTPP-dimer) molecules on the Ag(111) surface have been investigated using scanning tunnelling microscopy/spectroscopy (STM/STS) and low-energy electron diffraction (LEED). At one monolayer (ML) coverage the NiTPP-dimer forms a well-ordered close-packed molecular layer in which the porphyrin molecules have a flat orientation with the molecular plane lying parallel to the substrate. STM and LEED data obtained from one monolayer of the NiTPP-dimer on the Ag(111) surface show the formation of three domains which grow along the main crystallographic directions of the substrate. Scanning tunnelling spectroscopy data obtained from the NiTPP-dimer on the Ag(111) surface show good agreement with optical band gap measurements and density functional theory calculations.
authors.affiliation: School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland. Sergey.Krasnikov@dcu.ie
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Krasnikov
authors.forename: Natalia N
authors.initials: NN
authors.lastname: Sergeeva
authors.forename: Yulia N
authors.initials: YN
authors.lastname: Sergeeva
authors.forename: Mathias O
authors.initials: MO
authors.lastname: Senge
authors.forename: Attilio A
authors.initials: AA
authors.lastname: Cafolla