Preparation, solution behaviour and electrical properties of octasubstituted phthalocyaninato and 2,3-naphthalocyaninato oxotitanium(IV) complexes

Abstract

The octasubstituted oxo(phthalocyaninato)titanium(iv) complexes TiO[Pc′(CH₂OC₅H₁₁)₈ ] (Pc′=2,3,9,10,16,17,23,24-octasubstituted phthalocyaninate) and TiO[Pc″(OC₄H₉)₈ ] (Pc″=1,4,8,11,15,18,22,25-octasubstituted phthalocyaninate) and the first 2,3,-naphthalocyaninato titanium complex TiO[Nc′(C₆H₁₃)₈ ] (Nc′=2,5,11,14,20,23,29,32-octasubstituted naphthalocyaninate) have been prepared by treating the corresponding dicyano-benzenes or -naphthalene with titanium(iv) ethoxide and urea in n-pentanol. These compounds and their analogues TiO[Pc′(R)₈ ] (R=C₇H₁₅ , OC₅H₁₁) tend to form molecular aggregates in solutions and the effects of solvent and concentration on their aggregation behaviour were investigated by UV–VIS and ¹H NMR spectroscopy. The electrochemistry and electrical properties of these compounds were also studied.