FROM THE SINGLE-TO THE TRIPLE-DECKER SANDWICH - EFFECT OF STACKING ONTHE REDOX AND UV-VISIBLE SPECTROSCOPIC PROPERTIES OF LUTETIUM(III) 1,2-NAPHTHALOCYANINATE COMPLEXES

(1,2-Naphthalocyaninato)lutetium(III), bis(1,2-naphthalocyaninato)lute tium(III), and tris(1,2-naphthalocyaninato)dilutetium(III) have been s ynthesized in good yields. These complexes were characterized by UV-vi sible, H-1 NMR, and mass spectroscopies and by electrochemical techniq ues. Bis(1,2-naphthalocyaninato)lutetium(III) is compared to bis(2,3-n aphthalocyaninato)lutetium(III) : the good correspondance between the experimental data and theoretical results obtained by others is emphas ized in this work. Stacking one to three-macrocyclic rings is possible in the series of the 1,2-naphthylocyanine sandwich-like complexes wit h lutetium(III); as shown by UV-visible spectroelectrochemistry and vo ltammetry, this influences greatly the pi-conjugated systems, modifyin g spectacularly their spectroscopic and redox properties.