Bis(2,3 -naphthalocyaninato)lutetium(III) and (2,3 -naphthalocyaninato) (phthalocyaninato)lutetium(III) have been synthesized by condensation, with lutetium acetate, of 2 equiv of dilithium 2,3-naphthalocyaninate or with 1 equiv of dilithium phthalocyaninate and 1 equiv of the dilithium 2,3-naphthalocyaninate. These compounds were characterized by UV/visible, IR, H-1 NMR, and MS spectroscopies and electrochemical techniques. The unpaired electron is delocalized over the two macrocycles of the sandwich-type complexes. The HOMO-LUMO gap, 0.28 V, is the narrowest ever reported for compounds of this type.