THERMOPHYSICAL AND STRUCTURAL INVESTIGATIONS OF CRYSTALLINE SOLVATES BASED ON TETRAPHENYLPORPHYRIN AND ITS COPPER COMPLEX

The influence of temperature changes on the thermal and structural beh aviour of crystalline solvates of tetraphenylporphyrin (H2TPP) with 1, 4-dioxane and of tetraphenylporphyrin copper complexes (CuTPP) with be nzene were investigated using thermogravimetry, differential scanning calorimetry and X-ray powder diffraction. Simultaneous application of thermal and structural techniques made it possible to observe the comp lex evolution of the desolvation processes. These techniques enabled: (a) the separation of the two crystalline phases appearing during the process, (b) the detection of changes of the symmetry of the crystal l attice of CuTPP crystalline solvate from monoclinic and triclinic, (c) the determination of the heat and activation energy of desolvation pr ocess, and (d) the observation of reversible thermal effects for H2TPP .