title: Synthesis, Properties, and Two-Dimensional Adsorption Characteristics of 5-Amino[6]hexahelicene.
abstract: A convergent synthesis of racemic 5-amino[6]hexahelicene is described. Cross-coupling reactions are used to assemble a pentacyclic framework, and a metal-catalyzed ring-closure comprises the final step. The enantiomers were separated by means of chromatography and the absolute configurations were assigned by comparison of the CD spectra with hexahelicene. The t1/2  value for racemization at 210 °C was approximately 1 hour. Scanning tunneling microscopy (STM) measurements were carried out on enantiopure and racemic samples of aminohelicene on Au(111) under ultrahigh vacuum (UHV) conditions.
authors.affiliation: Syncom BV, Kadijk 3, 9747, AT Groningen, The Netherlands.
authors.forename: Maarten W
authors.initials: MW
authors.lastname: van der Meijden
authors.affiliation: Nano Fiber Matrices B.V., Zernikepark 6, 9747, AN Groningen, The Netherlands.
authors.forename: Edith
authors.initials: E
authors.lastname: Gelens
authors.affiliation: Centro Atómico Bariloche, CNEA and CONICET, Av. E. Bustillo km. 9.500, R8402AGP, San Carlos de Bariloche, Argentina.|Instituto Tecnologico de Costa Rica, A-4, Tecnológico de Costa Rica, Cartago, Costa Rica.
authors.forename: Natalia Murillo
authors.initials: NM
authors.lastname: Quirós
authors.affiliation: Centro Atómico Bariloche, CNEA and CONICET, Av. E. Bustillo km. 9.500, R8402AGP, San Carlos de Bariloche, Argentina.
authors.forename: Javier D
authors.initials: JD
authors.lastname: Fuhr
authors.affiliation: Centro Atómico Bariloche, CNEA and CONICET, Av. E. Bustillo km. 9.500, R8402AGP, San Carlos de Bariloche, Argentina.
authors.forename: J Esteban
authors.initials: JE
authors.lastname: Gayone
authors.affiliation: Centro Atómico Bariloche, CNEA and CONICET, Av. E. Bustillo km. 9.500, R8402AGP, San Carlos de Bariloche, Argentina.
authors.forename: Hugo
authors.initials: H
authors.lastname: Ascolani
authors.affiliation: Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria.
authors.forename: Klaus
authors.initials: K
authors.lastname: Wurst
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland. magali.lingenfelder@epfl.ch.
authors.forename: Magalí
authors.identifier: http://orcid.org/0000-0003-1362-8879
authors.initials: M
authors.lastname: Lingenfelder
authors.affiliation: Syncom BV, Kadijk 3, 9747, AT Groningen, The Netherlands. r.m.kellogg@syncom.nl.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Kellogg
keywords: cross-coupling; helicenes; optical properties; resolution; scanning tunneling microscopy