Abstract
The concept of molecular semiconductors is now well established and admitted. The first molecular semiconductor described is the lutetium bisphthalocyanine solute, LuPc 2·CH 2Cl 2. Together with its electrical properties, lutetium bisphthalocyanine exhibits very interesting and specific magnetic properties. The present paper is devoted to the magnetism of the lutetium bisphthalocyanine molecule and of the magnetism of the two crystalline states derived from this molecule. The radical of the molecule is localized on one macrocycle of this sandwich-type molecule but the wave function of this unpaired π-electron has a high spatial extension on this macrocycle. The bisphthalocyanine molecule leads to two different crystalline states. These two systems are Heisenberg paramagnets and have been studied by several resonance techniques: continuous wave ESR, NMR and pulsed ESR. All the results are consistent with a diffusive behaviour of spin correlation functions in the electronic frequency range. Depending on the system, i.e., depending on the crystalline structure, spin diffusion is one or two dimensional and is highly anisotropic in both cases.
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