Temperature dependence on recrystallisation of the MAGNESIUM PHTHALOCYANINE (cas 1661-03-6) (MgPc) in triethylamine

Add time:10/01/2019    Source:sciencedirect.com

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), depending on the thermal recrystallisation conditions 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 the biaxial (4 + 2) coordination. Owing to the interaction of the positively charged Mg center with oppositely charged oxygen atom of water molecule in an axial position in I, the Mg atom is significantly displaced (0.451(2) Å) from the plane defined by four isoindole N atoms and leads to distortion of the planar Pc(2−) macrocycle to the saucer-shape form. In II and III due to the biaxial (4 + 2) coordination of the Mg center of MgPc, the Mg atom lies on a N4-isoindole plane. The triethylamine solvent molecules in I and II interact with mono or bis(aqua)MAGNESIUM PHTHALOCYANINE (cas 1661-03-6) via O–H⋯N hydrogen bonds. The axial Mg–O bond in I is significantly shorter than that in the II and III complexes. The strength of the Mg–O bond in these complexes is correlated with their thermal stability. From among the complexes only complex I exhibits an intense near-IR absorption band in the solid-state. The spectra of I, II and III in solution are very similar.

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