Studies on an unsymmetrically substituted metal-free phthalocyanine

Summary form only given. Organic molecules with strong electron donor and electron acceptor groups that are connected by a large conjugated /spl pi/-electron system usually show high /spl beta/ values. Phthalocyanines, which have a large /spl pi/-conjugated macrocyclic ring, might have relatively large /spl beta/ values after they are unsymmetrically substituted with donor and acceptor groups. In a previous work, we described the synthesis of a phthalocyanine derivative with a nitro group as an acceptor substiuent and three tert-butyl groups, as doner substituents, namely nitro-tri-tert-butylphthalocyanine. In this presentation, we study the thermal stability by thermo-gravimetric analysis, the dipole moment and cyclic voltammetry measurement of such a compound. Nonlinear optical behavior from its Langmuir-Blodgett films is also investigated. These physical and chemical properties are discussed in terms of its chemical structure.