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    Cobalt salen functionalised polycrystalline gold surfaces

    Year: 2008

    Journal: Thin Solid Films, Volume 516, Issue 10, 31 March 2008, Pages 2948-2956, 20111221

    Authors: Minna T. Räisänen, Pedro de Almeid, Kristoffer Meinander, Marianna Kemell, Ilpo Mutikainen, Markku Leskelä and Timo Repo

    Organizations: Accelerator Laboratory, Department of Physical Sciences, University of Helsinki, P.O. Box 43, FI-00014 University of Helsinki, Finland, Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 University of Helsinki, Finland

    The ability of N,N′-ethylene-bis(4-dodecyloxysalicylideneiminato)Co(II) (4) and literature known N,N′-ethylene-bis(3,5-di-t-butylsalicylideneiminato)Co(II) (5) to coordinate molecular oxygen was studied using ultraviolet–visible spectroscopy. For a comparison, the study was complemented with the archetype Co(II) salen (salen = N,N′-ethylene-bis(salicylideneamine)) complex. Especially 4, bearing long alkoxy chain substituents, coordinates dioxygen efficiently and reversibly, and therefore is an attractive candidate for further development of functional surfaces e.g. towards molecular level dioxygen sensors. In this respect, complexes 4 and 5 were attached on two different 4-pyridinethiol pre-treated polycrystalline Au surfaces. The changes in surface morphology after pyridinethiol and the complex treatment were studied with atomic force microscopy (AFM) measurements. Accordingly, with this method fairly smooth surfaces bearing cobalt(II) salen complexes can be prepared. In addition, the AFM results were complemented by X-ray reflection, cyclic voltammetry and wettability studies.