Copper phthalocyanine (CuPC), an organometallic pigment, exists in various modifications. Of commercial interest are alpha-, beta- and epsilon-CuPC. The most stable one is beta-CuPC. All other polymorphs change into the beta-modification at 250 to 400°C.
In this case phase transfers of alpha-CuPC and epsilon-CuPC are analysed at constant temperature to get information about the kinetics. Of particular interest is the influence of additives and mixtures to the order of the reaction. Therefore, fast in-situ powder diffraction data were recorded at the ANKA synchrotron in Karlsruhe using MAR CCD detector. All measured data are refined by sequential Rietveld refinement and the influence of the experimental geometry is described by a resolution function derived from LaB₆ standard. The results are analyzed by using the Johnson-Mehl-Avrami equation.

Fig. 1: Time dependent synchrotron powder diffraction data of alpha-CuPC measured at T=250°C.

References:
Erk, P. & Hengelsberg, H. (2003): In: Kadish, K.M., Smith, K.M. & Guilard, R.: The porphyrine handbook, vol.19.

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