title: Polymorphism in porphyrin monolayers: the relation between adsorption configuration and molecular conformation.
abstract: Self-assembled monolayers of meso-5,10,15,20-tetrakis(undecyl)porphyrin copper(II) on a graphite/1-octanoic acid interface have been studied by Scanning Tunnelling Microscopy. Four distinct polymorphs were observed, varying in their unit cell size. Arrays of unit cells of the various polymorphs seamlessly connect to each other via shared unit cell vectors. The monolayers are not commensurate, but coincident with the underlying graphite substrate. The seamless transition between the polymorphs is proposed to be the result of an adaptation of the molecular conformations in the polymorphs and at the boundaries, which is enabled by the conformational freedom of the alkyl tails of these molecules.
authors.affiliation: Radboud University Nijmegen, Institute for Molecules and Materials, Nijmegen, The Netherlands.
authors.forename: Michiel J J
authors.initials: MJ
authors.lastname: Coenen
authors.forename: Duncan
authors.initials: D
authors.lastname: den Boer
authors.forename: Fieke J
authors.initials: FJ
authors.lastname: van den Bruele
authors.forename: Thomas
authors.initials: T
authors.lastname: Habets
authors.forename: Koen A A M
authors.initials: KA
authors.lastname: Timmers
authors.forename: Minko
authors.initials: M
authors.lastname: van der Maas
authors.forename: Tony
authors.initials: T
authors.lastname: Khoury
authors.forename: Dwi
authors.initials: D
authors.lastname: Panduwinata
authors.forename: Maxwell J
authors.initials: MJ
authors.lastname: Crossley
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Reimers
authors.forename: Willem J P
authors.initials: WJ
authors.lastname: van Enckevort
authors.forename: Bas L M
authors.initials: BL
authors.lastname: Hendriksen
authors.forename: Johannes A A W
authors.initials: JA
authors.lastname: Elemans
authors.forename: Sylvia
authors.initials: S
authors.lastname: Speller
mesh_terms: D000327:Adsorption; D002210:Caprylates / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D016252:Microscopy, Scanning Tunneling; D008968:Molecular Conformation; D011166:Porphyrins / Q000737:chemistry*
chemical_list: D002210:Caprylates; D011166:Porphyrins; D006108:Graphite; D003300:Copper; C031492:octanoic acid