Controlling intermolecular spin interactions of La@C82 in empty fullerene matrices

Abstract

The ESR properties and crystal structures of solid-state La@C(82) in empty fullerene matrices were investigated by changing the concentration of La@C(82) and the species of an empty fullerene matrix: C(60), C(70), C(78)(C(2v)(3)), C(82)(C(2)) and C(84)(D(2d)(4)). The rotational correlation time of La@C(82) molecules tended to be shorter when La@C(82) is dispersed in larger fullerene matrices because large C(2n) molecules provide more space for La@C(82) molecules for rotating. La@C(82) dispersed in a hcp-C(82) matrix showed the narrowest hyperfine structure (hfs) due to the ordered nature of La@C(82) molecules in the C(82) crystal. On the other hand, in a C(60) matrix, La@C(82) molecules formed clusters because of the large different solubility, which leads to the ESR spectra being broad sloping features due to strong dipole-dipole and exchange interactions.

A two-step approach to the synthesis of N@C60 fullerene dimers for molecular qubits

“…For molecular systems, chemical engineering offers a high degree of control over the spacing of spin centres, and inter-molecular couplings may be reduced by dispersal in a diamagnetic matrix. 2,3 Endohedral fullereneswhere atoms, ions or clusters are encapsulated in a carbon cageare attractive as elements in a QIP architecture owing to their native spin properties. 4,5 Of particular interest is N@C 60 , 6 as quantum information can be stored faithfully using its electron spin for 0.25 ms (ref.…”

Electron spin coherence in metallofullerenes: Y, Sc, andLa@C82

“…Several electron paramagnetic resonance (EPR) studies have been conducted on the metallofullerenes Sc-, Y-and La@C 82 focusing on geometric and electronic properties of the molecules [4,5,[13][14][15][16][17][18]. These, along with x-ray diffraction measurements, have shown the metal atom to be off centre in the cage [19][20][21], with charge transfer to the cage dependent on the metal ion species [22].…”

“…In particular, metallofullerenes can self-assemble within carbon nanotubes in a 'peapod' structure, creating a 1-D spin chain [6,[10][11][12]. For the potential of such structures to be fully realised, longer electron spin coherence times are required of the constituent metallofullerenes.Several electron paramagnetic resonance (EPR) studies have been conducted on the metallofullerenes Sc-, Y-and La@C 82 focusing on geometric and electronic properties of the molecules [4,5,[13][14][15][16][17][18]. These, along with x-ray diffraction measurements, have shown the metal atom to be off centre in the cage [19][20][21], with charge transfer to the cage dependent on the metal ion species [22].…”

Nanotechnology: A Modern Contraption in Cosmetics and Dermatology

“…Fullerenes are spherical molecules of carbon atoms measuring about 1 nm in diameter. Recently, some researchers developed a fullerene nanocapsule with ascorbic acid and vitamin E which showed enhanced skin protective activity against premature aging by its antioxidant activities [21,22]. A nanocapsule is a nano-scale shell vesicular system made from a non-toxic polymeric membrane which encapsulates an inner liquid core at the nanoscale.…”