TY - JOUR

T1 - Synthesis and immobilization of molecular switches onto titaniumdioxide nanowires

AU - Tahir, Muhammad Nawaz

AU - Messerschmidt, Markus

AU - Klein, Michael

AU - Martinez, Victor

AU - Theato, Patrick

AU - Metz, Nadine

AU - Hartmann, Sonngard

AU - Kolb, Ute

AU - Ksenofontov, Vadim

AU - Renz, Franz

AU - Tremel, Wolfgang

N1 - Funding Information: This work was partly funded by the DFG (Re-1627/1-3), the “Fonds der chemischen Industrie”, the University of Mainz (“Forschungsfond”; “Material-Wissenschaftliches Forschungs-Zentrum” = MWFZ), and the Leibniz University of Hannover.

PY - 2009/6/22

Y1 - 2009/6/22

N2 - The precursor [FeIII(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, [MoIV{(CN)FeIII(L)}8]Cl4. 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 Mössbauer 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 Mössbauer spectroscopy. High- and low-temperature Mössbauer 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.

AB - The precursor [FeIII(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, [MoIV{(CN)FeIII(L)}8]Cl4. 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 Mössbauer 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 Mössbauer spectroscopy. High- and low-temperature Mössbauer 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.

KW - High-spin molecule

KW - Metal cluster

KW - Mo(IV)-Fe(III)

KW - Spin-crossover

KW - Surface immobilization

KW - TiO nanowire

UR - http://www.scopus.com/inward/record.url?scp=67349242993&partnerID=8YFLogxK

U2 - 10.1016/j.poly.2008.10.071

DO - 10.1016/j.poly.2008.10.071

M3 - Article

AN - SCOPUS:67349242993

VL - 28

SP - 1728

EP - 1733

JO - POLYHEDRON

JF - POLYHEDRON

SN - 0277-5387

IS - 9-10

ER -