A series of bis (phthalocyaninato) lutetium complexes with substituents on each benzoring [Lu (pc 2 R 8)] was prepared and the electrochromic behavior investigated by means of cyclic voltammetry of coated electrodes. Although the unsubstituted complex, Lu (pc) 2, showed multistep electrochromism, its stability was quite unsatisfactory due to a falling-off of films from the electrode surface upon repetitive potential scanning. In the case of R= t- ...