title: From the Single- to the Triple-Decker Sandwich. Effect of Stacking on the Redox and UV-Visible Spectroscopic Properties of Lutetium(III) 1,2-Naphthalocyaninate Complexes.
abstract: (1,2-Naphthalocyaninato)lutetium(III), bis(1,2-naphthalocyaninato)lutetium(III), and tris(1,2-naphthalocyaninato)dilutetium(III) have been synthesized in good yields. These complexes were characterized by UV-visible, (1)H NMR, and mass spectroscopies and by electrochemical techniques. Bis(1,2-naphthalocyaninato)lutetium(III) is compared to bis(2,3-naphthalocyaninato)lutetium(III): the good correspondance between the experimental data and theoretical results obtained by others is emphasized in this work. Stacking one to three macrocyclic rings is possible in the series of the 1,2-naphthalocyanine sandwich-like complexes with lutetium(III); as shown by UV-visible spectroelectrochemistry and voltammetry, this influences greatly the pi-conjugated systems, modifying spectacularly their spectroscopic and redox properties.
authors.affiliation: Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, UMR CNRS No. 6521, Faculté des Sciences et Techniques, Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, B.P. 809, 29285 Brest Cedex, France.
authors.forename: François
authors.initials: F
authors.lastname: Guyon
authors.forename: Annig
authors.initials: A
authors.lastname: Pondaven
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Kerbaol
authors.forename: Maurice
authors.initials: M
authors.lastname: L'Her