Abstract
Unidirectionally oriented films of x-form lithium phthalocyanine (PcLi) have been obtained by electrodeposition onto ITO substrate and their magnetic properties studied by Electron Spin Resonance (ESR). The tuning of the microcrystallite mean size and orientation is obtained by the control of the deposition parameters including electrolysis time and the chemical nature of the solvent. The magnetic properties of films of thickness ca. 1μm are found to be identical to those of bulk single crystals i.e. they show a narrow ESR signal of linewidth ca. 20-30 mG under vaccum which broadens linearly with the dioxygen pressure. Our ESR study also reveals some exceptional mesoscopic effects. The ESR signal linewidth ΔH ESR is found to follow a power law of the mean microcrystallite size.
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