Temperature dependence on recrystallisation of the magnesium phthalocyanine (MgPc) in triethylamine

Three complexes of magnesium phthalocyaninato(2−) derivatives in the crystalline form, MgPc(H2O)·(C2H5)3N - (I), MgPc(H2O)2·2(C2H5)3N - (II) and MgPc(H2O)2 - (III), were obtained and structurally characterised. In complex I, the Mg center exhibits square-pyramidal (4 + 1) coordination environment, whereas in II and III the Mg center of MgPc exhibit the biaxial (4 + 2) coordination. Only the complex I exhibits an intense near-IR absorption band in the solid-state.