The mononuclear Fe(ii) phthalocyanine 2 and ball-type homobinuclear Fe(ii)-Fe(ii) and Cu(ii)-Cu(ii) phthalocyanines, 3 and 4 respectively, were synthesized from the corresponding 4,4′-[1,1′-methylenebis- (naphthalene-2,1-diyl)]bis(oxy)diphthalonitrile 1, and then ball-type heterobinuclear Fe(ii)-Cu(ii) phthalocyanine 5 was synthesized from 2. The novel compounds 4 and 5 have been characterized by elemental analysis, UV/vis, IR and MALDI-TOF mass spectroscopies. Electron paramagnetic resonance and magnetic circular dichroism measurements of 3, 4 and 5 were also examined. The voltammetric measurements of the complexes showed the formation of various electrochemically stable ligand- and metal-based mixed-valence species, due to the intramolecular interactions between the two MPc units, especially in ball-type binuclear iron(ii) phthalocyanine. Impedance spectroscopy and d.c. conductivity measurements of 4 and 5 were performed as a function of temperature (295-523 K) and frequency (40-105 Hz). While room temperature impedance spectra consist of a curved line, a transformation into a full semicircle with increasing temperature was observed for both compounds.
ASJC Scopus subject areas
- Inorganic Chemistry