Synthesis and immobilization of molecular switches onto titaniumdioxide nanowires
POLYHEDRON. Bd. 28. H. 9-10. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD 2009 S. 1728 - 1733
Erscheinungsjahr: 2009
ISBN/ISSN: 0277-5387
Publikationstyp: Zeitschriftenaufsatz
Sprache: Englisch
Doi/URN: 10.1016/j.poly.2008.10.071
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Inhaltszusammenfassung
The precursor [Fe-III(L)Cl (L = N,N'-bis(2'-hydroxy-3'-methyl-benzyliden)-1,7-diamino-4-azaheptane) is combined with [Mo(CN)(8)](4-) yields a star shaped nona-nuclear cluster, [Mo-IV{(CN)Fe-III(L)}(8)]Cl-4. This Fe8Mo molecule is a high-spin system at room temperature. On cooling to 20 K some of the iron(III) centres in the molybdenum(IV)-star switch to the low-spin state as proven by Mossbauer spectroscopy. This molecule was deposited on TiO2 nanowires by electrostatic interactions between t...The precursor [Fe-III(L)Cl (L = N,N'-bis(2'-hydroxy-3'-methyl-benzyliden)-1,7-diamino-4-azaheptane) is combined with [Mo(CN)(8)](4-) yields a star shaped nona-nuclear cluster, [Mo-IV{(CN)Fe-III(L)}(8)]Cl-4. This Fe8Mo molecule is a high-spin system at room temperature. On cooling to 20 K some of the iron(III) centres in the molybdenum(IV)-star switch to the low-spin state as proven by Mossbauer spectroscopy. This molecule was deposited on TiO2 nanowires by electrostatic interactions between the cluster cations and the surface functionalized titanium oxide nanowire. The synthesis and surface binding of the multistable molecular switch was demonstrated using IR and UV-Vis spectroscopy (high-resolution) transmission electron microscopy ((HR)TEM) and Mossbauer spectroscopy. High- and low-temperature Mossbauer spectra indicate that the spin state transition of the free cluster molecules is preserved after surface binding. The above results emphasize the possibility of fabricating molecule-based low-dimensional structures by using traditional bottom-up approaches based on the electrostatic interaction between the cluster cations and polymer functionalized nanowires. These results can be generalized for the application to both charged and non-charged molecules. (C) 2008 Elsevier Ltd. All rights reserved. » weiterlesen» einklappen
