Functional (Supra)Molecular Nanostructures - ruben-group

Recommendations

Info

Habilitation Dr. Mario Ruben ULP Strasbourg 8.2. Current Research Projects 8.2.1. Kondo-Molecules and <strong>Molecular</strong> Spintronics (Project supported by the Deutsche Forschungsgemeinschaft) The interaction of metals and molecules is a field which has recently attracted increasing attention due to the appearance of molecular electronics. Thereby, two different electronic regimes are combined: (i) the electrons of a simple metal (e.g. gold) can be considered as non-interacting quasiparticles resulting in a quasi-continuous description of the density of states (DOS) at low temperatures, whereas (ii) the electrons in a molecule are commonly highly correlated and show discrete electronic levels. In this project, we will create and investigate systems where a molecule on the surface induces electron correlations in the metal by controlled electron-metal interactions. In particular, the emergence of Kondo phenomena (or Abrikosov-Suhl resonances) in the metallic electron system by immobilization of spin-bearing coordination compounds (Ln and Co compounds) on (A) thin surfaces or between (B) nano-structured electrodes will be studied. Thereby, the main observable parameter will be (i) in the case of surfaces: the temperature and field dependence of the resistivity of a thin metal film (ii) in the case of nanostructured electrodes the I/V dependence of a current passing through the spin-bearing molecule (Figure 28). A) B) Figure 28. Sketch of the two configurations where the Kondo effect is expected: left: (A) molecule on top of a gold film, right: (B) molecule contacted to two electrodes in a break junction setup. The requirements of the molecules are delicate: on one hand, the free spin must survive when the molecule is in contact with the surface or the electrodes and on the other hand, the electronic coupling between the free spin and the conduction electrons must be sufficiently strong to make Kondo scattering efficient (and to keep the Kondo temperature in a convenient temperature range). 43
Habilitation Dr. Mario Ruben ULP Strasbourg 8.2.2. Shaping the Interface - Binary Metal Arrays (Fun-Smarts project supported by the European Science Foundation) The design of low-dimensional molecule-based magnetic systems has become an attractive topic within the broad field magnetism. One of the advantages of this strategy is to the ability to include approaches from different research areas ranging from surface science to surpramolecular chemistry in order to fabricate surface-supported magnetic molecular architectures. The flexibility in the rational design of such a metal ion-organic ligand approach may allow the controlled introduction of different magnetic centres into the surface- supported architectures. Based on the tetragonal network structures with Fe2-dimers at the crossing points obtained using linear bis-carboxylic acid ligands in the surface-assisted self-assembly, as described in chapter 4.2.C, we would like to extend this strategy to build in a second metal ion rendering binary metal ion structures. Towards this goal, we have synthesized the 4,4´´´-(1- dicarboxyphenyl)-substituted bipyrimidine system (DCP). [59] We plan to coordinate two different metal ions by a two step surface-assisted coordination procedure: The first coordination step should introduce one metal as dimers at the crossing points of the formed network. The second metal will be subsequently introduced at the preorganized pyrimidine N- donor atoms by N-metal bond formation (Figure 29). Figure 29. Representation of the generation of extended binary metal arrays using principles of surface-assisted coordination chemistry. 44
Page 1 and 2: Habilitation Dr. Mario Ruben ULP St
Page 27 and 28: 6. Molecular Magnetism Habilitation
Page 37 and 38: 7. Molecular Electronics Habilitati
Page 43: Habilitation Dr. Mario Ruben ULP St
Page 47 and 48: 9. Conclusion Habilitation Dr. Mari
Page 55: Habilitation Dr. Mario Ruben ULP St
Page 58 and 59: Highlights previously described gri
Page 60 and 61: Metallosupramolecular Chemistry Rec
Page 62 and 63: Metallosupramolecular Chemistry Fig
Page 64 and 65: Metallosupramolecular Chemistry Tho
Page 66 and 67: Metallosupramolecular Chemistry two
Page 70 and 71: Metallosupramolecular Chemistry (Fi
Page 72 and 73: Metallosupramolecular Chemistry The
Page 76 and 77: Metallosupramolecular Chemistry [3]
Page 78 and 79: DOI: 10.1039/b303922f Synthesis of
Page 82 and 83: enable a highly efficient informati
Page 84 and 85: implies a multistep SC process, whi
Page 86 and 87: e716 Scheme 1. Fig. 1. 1 H-NMR spec
Page 88: FULL PAPER Supramolecular Spintroni
Page 91 and 92: Supramolecular Spintronic Devices 4
Page 93 and 94: Supramolecular Spintronic Devices 4
Page 95 and 96:
Supramolecular Spintronic Devices 4
Page 97 and 98:
merge, since the molecular surround
Page 99 and 100:
Supramolecular Spintronic Modules F
Page 101 and 102:
Supramolecular Spintronic Modules r
Page 103 and 104:
APS/123-QED Quantum Tunneling of th
Page 105 and 106:
certain fields, which are shifted t
Page 107 and 108:
[3] Transition metal catalyzed form
Page 109 and 110:
transfer of four electrons at ‡1.
Page 111 and 112:
Functional Supramolecular Devices:
Page 113 and 114:
Functional Supramolecular Devices 2
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
��¨
Page 123 and 124:
��
Page 125 and 126:
ΔE 0.06 0.05 0.04 0.03 0.02 0.01 0
Page 127 and 128:
�¦��
Page 129 and 130:
Figure 1. The masters on the roof o
Page 131 and 132:
to have approached him in late 1926
show all

Functional (Supra)Molecular Nanostructures - ruben-group

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?