title: Neutral nickel(II) and copper(II) tetraazamacrocyclic complexes as molecular rods attached to gold electrodes.
abstract: New dithiolated derivatives of neutral Cu(II) and Ni(II) tetraazamacrocyclic complexes have been synthesized and characterized by spectroscopic and diffractional methods. These rod-shaped molecules were assembled in monocomponent and mixed monolayers on gold electrodes. In the mixed monolayers, the active molecules were embedded in a hexanethiol matrix. The dithiolated complexes are oriented perpendicularly to the electrode, and reveal faster kinetics of electron transfer than those assembled in a single-component monolayer. They appear as protrusions, which are easily addressed by using the STM method. In the presence of a suitable electron acceptor in the solution, the donor properties of the anchored Cu complex were weakened, which revealed donor-acceptor interactions with the monolayer. The peak position in the voltammogram indicates a stronger interaction of the solution-based acceptor with the reduced Cu(II) form than with the Cu(III) complex. This suggests the possibility of switching the association on or off by applying an appropriate potential.
authors.affiliation: Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland.
authors.forename: Urszula E
authors.initials: UE
authors.lastname: Wawrzyniak
authors.forename: Mateusz
authors.initials: M
authors.lastname: Woźny
authors.forename: Jarosław
authors.initials: J
authors.lastname: Kowalski
authors.forename: Sławomir
authors.initials: S
authors.lastname: Domagała
authors.forename: Elwira
authors.initials: E
authors.lastname: Maicka
authors.forename: Renata
authors.initials: R
authors.lastname: Bilewicz
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Woźniak
authors.forename: Bohdan
authors.initials: B
authors.lastname: Korybut-Daszkiewicz