Abstract
Co (II)-phthalocyanine ( CoPc ) was synthesized in the cages of a NaY faujasite matrix and in NaY with co-encapsulated highly dispersed Ti (IV) oxide species. As expected the encaged complexes were immobilized and could not be removed by extraction procedures. Unexpected were reversible aggregations of the CoPc molecules, revealed from DR-UV-vis spectra. The phenomena were attributed to frequently observed (i) local enrichments of the CoPc molecules, i.e., their non-uniform distribution throughout the zeolite crystals, and (ii) local damages, facilitating the contact between CoPc molecules. The aggregations are mediated by co-guests, like Ti (IV) oxide species or pyridine, i.e. by guest-guest interactions, whereas the segregation is induced by host-guest interactions between CoPc and the zeolite framework.
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