Anchoring of rare-earth-based single-molecule magnets on single-walled carbon nanotubes.
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 pi-pi 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.
Institut fur Nanotechnologie, Karlsruhe Institute of Technology (KIT), D-76021 Karlsruhe, Germany.
Svetlana
S
Kyatskaya
José Ramón Galán
JR
Mascarós
Lapo
L
Bogani
Frank
F
Hennrich
Manfred
M
Kappes
Wolfgang
W
Wernsdorfer
Mario
M
Ruben