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Anchoring of Rare-Earth-Based Single-Molecule Magnets on Single-Walled Carbon Nanotubes

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journal contribution
posted on 28.10.2009, 00:00 by Svetlana Kyatskaya, José Ramón Galán Mascarós, Lapo Bogani, Frank Hennrich, Manfred Kappes, Wolfgang Wernsdorfer, Mario Ruben
A new heteroleptic bis(phthalocyaninato) terbium(III) complex 1, bearing a pyrenyl group, exhibits temperature and frequency dependence of ac magnetic susceptibility, typical of single-molecule magnets. The complex was successfully attached to single-walled carbon nanotubes (SWNTs) using π−π interactions, yielding a 1−SWNT conjugate. The supramolecular grafting of 1 to SWNTs was proven qualitatively and quantitatively by high-resolution transmission electron microscopy, emission spectroscopy, and atomic force spectroscopy. Giving a clear magnetic fingerprint, the anisotropy energy barrier and the magnetic relaxation time of the 1−SWNT conjugate are both increased in comparison with the pure crystalline compound 1, likely due to the suppression of intermolecular interactions. The obtained results propose the 1−SWNT conjugate as a promising constituent unit in magnetic single-molecule measurements using molecular spintronics devices.