Multifunctionality by Self-Assembly of Hybrid Molecular Materials (MULTI-Fun)
Zusammenfassung der Projektergebnisse
In conclusion, we have designed, synthesized and characterized two different types of metal complexes, the bis-phthalocyaninato terbium (III) molecule with different chemical suraundings of metal-center (i.e. different oxidation states of complexex – neutral and negativly charged; bearing electron-withdrowing groups like –CN or pyren-group anable anchoring of SMM on a surface of SWMTs) and binuclear Co(II) dimer complexes to be used as defined SMMs in single moelcule measurments. The SMM behavior of the bulk heteroleptic bis-phthalocyaninato terbium (III) complex was proved by ac susceptibility and micro-SQUID investigations. A SMM-SWNT magnetic conjugate was obtained by supramolecular assembly of complex via π-interactions of the pyrenefunctionality with highly purified SWNTs. These results open a chemical route to single rare-earth centers as constituent units for SWNT-based spintronic devices, thus allowing the exploitation of their fingerprint parity effects in the quantum tunneling of the magnetization. Moreover, such systems display coherence times longer than those of comparable SMM that have been used to produce SMM-SWNT hybrids, and this could be used for quantum information single-molecule experiments. Eventually, these compounds are very promising candidates for single-molecule magnetic measurements, both when grafted on SWNTs connected to superconducting electrodes, as in the nano-SQUID, and when attached to metallic SWNTs connected to Pd electrodes, which would allow the observation of magneto-Coulomb effects. Although oxalamidines are theoretically good bridging ligands able to bridge paramagnetic d-metal ions for effectively providing strong magnetic coupling, our results show that more elements need to be taken into account for successfully building magnetic compounds with transition metal ions.
Projektbezogene Publikationen (Auswahl)
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“Synthesis, structure and physical characterization of the dimmer {[(bpy)2Co]2(TPOA)}4+ (bpy = 2,2′-dipyridyl; H2TPOA = N,N′,N′′,N′′′-tetraphenyl oxalamidine)“, Journal of Molecular Structure 2008, 890, 272–276
Martí-Gastaldo, C., Qu, Z-R., Tatay, S., Ruben, M., Galan- Mascaros, J-R.
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“Anchoring of Rare-earth based Single-Molecule Magnets on Single-Walled Carbon Nanotubes”, J. Am. Chem. Soc. 2009, 131, 15143- 15151
Klyatskaya, S., Galán Mascarós, J.-R.; Bogani, L., Hennrich, F., Kappes, M., Wernsdorfer, W.; Ruben, M.
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“Spin Dynamics in the Negatively Charged Terbium (III) Bis-phthalocyaninato Complex”, J. Am. Chem. Soc. 2009, 131, 4387– 4396
Branzoli, F., Carretta, P., Filibian, F., Zoppellaro, G., Graf, M. J., Galan- Mascaros, J-R., Fuhr, O., Brink, S., Ruben M.
