title: Photocontrolled On-Surface Pseudorotaxane Formation with Well-Ordered Macrocycle Multilayers.
abstract: The photoinduced pseudorotaxane formation between a photoresponsive axle and a tetralactam macrocycle was investigated in solution and on glass surfaces with immobilized multilayers of macrocycles. In the course of this reaction, a novel photoswitchable binding station with azobenzene as the photoswitchable unit and diketopiperazine as the binding station was synthesized and studied by NMR and UV/Vis spectroscopy. Glass surfaces have been functionalized with pyridine-terminated SAMs and subsequently with multilayers of macrocycles through layer-by-layer self assembly. A preferred orientation of the macrocycles could be confirmed by NEXAFS spectroscopy. The photocontrolled deposition of the axle into the surface-bound macrocycle-multilayers was monitored by UV/Vis spectroscopy and led to an increase of the molecular order, as indicated by more substantial linear dichroism effects in angle-resolved NEXAFS spectra.
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.
authors.forename: Felix B
authors.initials: FB
authors.lastname: Schwarz
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.|BAM-Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203, Berlin, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Heinrich
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany.
authors.forename: J Ole
authors.initials: JO
authors.lastname: Kaufmann
authors.affiliation: BAM-Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203, Berlin, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Lippitz
authors.affiliation: University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014, Jyvaskyla, Finland.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Puttreddy
authors.affiliation: University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014, Jyvaskyla, Finland.
authors.forename: Kari
authors.initials: K
authors.lastname: Rissanen
authors.affiliation: BAM-Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203, Berlin, Germany. wolfgang.unger@bam.de.
authors.forename: Wolfgang E S
authors.initials: WE
authors.lastname: Unger
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany. c.schalley@fu-berlin.de.
authors.forename: Christoph A
authors.initials: CA
authors.lastname: Schalley
keywords: azobenzene; photochemistry; pseudorotaxanes; supramolecular chemistry; surface chemistry