The reaction of a double-decker phthalocyanine (Pc) complex, bis(phthalocyaninato)lutetium ([LuPc2](-)), with cadmium acetate at 400 degrees C for 30 min under argon provided the first example of a discrete quadruple-decker Pc complex, 1. The structure of 1 was unambiguously determined through the use of high-resolution mass spectrometry, elemental analysis, and NMR techniques such as H-1-H-1 COSY, C-13-H-1 COSY, and NOE experiments. The absorption and magnetic circular dichroism spectra of 1 resembled those of [LuPc2](-) and [Lu2Pc3] rather than those of the neutral double-decker species [LuPc2](0), since the formal charge on each Pc moiety is 2-. Electrochemical measurements exhibited a stacking effect based on the delocalization of the holes or electrons introduced by oxidation or reduction, respectively, over the entire complex.