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Absorption spectral changes observed during sodium mirror reduction of tribenzotetraazachlorin-fullerene (TBTAC-C60) conjugates have clarified that electronic communication between the TBTAC and C60 moieties is switched off upon reduction of the conjugates. Spectroscopy has suggested that the anionic species retains its aromatic character. [ABSTRACT FROM AUTHOR]

Magnetic relaxations arising from spin-phonon interactions for a magnetically diluted double-decker terbium phthalocyanine single molecule magnet, dil1, in the nonthermally activated temperature range have been investigated. While the relaxation time, τ, is independent of the external static magnetic field, Hdc, in the high temperature range, where linear relationships between -ln τ and T-1 are observed in the Arrhenius plot, magnetic field dependences for τ are observed in the lower temperature range. The τ-1 vs Hdc plot at 12 K fits the quadric curve when Hdc < 12 kOe, while linear relationships are observed in the τ-1 vs T plots in the temperature range of 12-20 K. These results indicate that the direct process is the dominant magnetic relaxation pathway in the nonthermally activated temperature range, while the contribution from the Raman process, if any, is not observable. We emphasize in this paper that the contribution from the thermal relaxation processes and the quantum tunneling of magnetizations (QTMs) to the experimentally observed magnetic relaxations must be evaluated carefully in order to avoid confusion between the thermal and quantum-mechanical relaxation pathways. [ABSTRACT FROM AUTHOR]

A tribenzotetraazachlorin (TBTAC)-C60conjugate having three 15-crown-5 units as substituents, 1, has been synthesized, and the electronic and supramolecular structure modulations in the presence of Na+or K+have been elucidated by means of massmetric and spectroscopic techniques. [ABSTRACT FROM AUTHOR]