Ruthenium complexe & mono-molecular logic gates
Staff: Jacques BONVOISIN, Mohamed HLIWA & Christian JOACHIM
Ph.D. students & Postdocs: Sabrina MUNERY (IE), Christine VIALA (AI)
Integrating a logical function in a single molecule should allow to reach the ultimate size of a material based calculator (C. Joachim, J.K. Gimzewski, A. Aviram, Nature, 2000, 408, J41). Several concepts are now under development to make a calculation using a single molecule:
1) to force a molecule to look like a classical electronic circuit but integrated inside the molecule. (S. Ami, M. Hliwa, C. Joachim, Chem. Phys. Lett., 2003, 367, 662 ; S. Ami, M. Hliwa, C. Joachim, Nanotechnology, 2003, 14, 283)
2) to divide the molecule into “qubits” in order to exploit the quantum engineering developed since several years around quantum computers.(M. A. Nielsen, I. L. Chuang, Quantum computation & quantum information, Cambridge University Press 2000)
3) to use intramolecular dynamical quantum behavior without dividing molecules into “qubits” leading to Hamiltonian quantum computer (C. Joachim, Nanotechnology, 2002, 13, R1; J. Fiurasek, N. J. Cerf, I. Duchemin, C. Joachim Physica E, 2004, 24, 161)
The project developed here consists of synthesizing a molecule which would be able to realize a logical function such as an inversor (SWAP). This molecular logical gate with an optical reset would be made of an IN/OUT ruthenium(III) bimetallic centers. These two ruthenium(III) ions would be in magnetic interaction through bonds, via conjugated organic backbones, with a third ruthenium ion. The magnetic interaction is switched ON and OFF depending on the oxidation state of the central ruthenium atom which can be changed by light by using the special properties of mixed valent system. Therefore the light will trigger the calculation by adding/removing an extra electron on the central ruthenium atom. The special feature of this target molecule constituted of four metallic centers is that coordination spheres around ruthenium atoms can be different by chosen substituents and then one can have optical access to chosen ruthenium atoms.
Several steps towards the target molecule have been made. Indeed, it is necessary to progress surely and to characterize each step of the full syntheses. The entities which constitute the target molecule have been realized. Now, the goal is to put all of these together in order to build di-, tri- and finally tetra- nuclear species. These poly-nuclear compounds would be studied by macroscopic methods (IR, X-Ray, UV/Visible/NIR, NMR, Mass spectroscopy, Electrochemistry, EPR, Magnetic Susceptibility) and also by atom base techniques (STM, AFM).
"UHV-STM Investigations and Numerical Calculations of a Ruthenium ß-Diketonato Complex with Protected Ethynyl Ligand: [Ru(dbm)2(acac-TIPSA)]" L. Vernisse, S. Munery, N. Ratel-Ramond, Y. Benjalal, O. Guillermet, X. Bouju, R. Coratger & J. Bonvoisin.
J. Phys. Chem. C 2012 116, 13715-13721 link
"Synthesis and Characterization of a Series of Ruthenium Tris(β-diketonato) Complexes by an UHV-STM Investigation and Numerical Calculations" S. Munery, N. Ratel-Ramond, Y. Benjalal, L. Vernisse, O. Guillermet, X. Bouju, R. Coratger & J. Bonvoisin.
Eur. J. Inorg. Chem. 2011, 2698–2705 link