Iron phthalocyanine (FePc), iron octocarboxyphthalocyanine [(COOH)8FePc] and their complexes carrying axial ligands were prepared and studied by vibrational and optical spectrometry. The ligands used are: pyridine and its derivatives 3-Rpyridine (with R = CH3, OH, Cl and OHCH2), 4-Rpyridine (with R = CH3, OH, CN and SH), phosphites and phosphine P(OPh3) , P(OMe)3, HOP(OEt)2 and PPh3. Analysis of the infrared spectra made it possible to highlight, in the spectra of the complexes, new bands of vibration were attributed to the axial ligands; which reflects the fact that the expected reactions have been realized. In optical spectrometry, inter and intramolecular interactions are reflected in the spectra of octasubstituted compounds by a dominant electron-donor effect. The introduction of axial ligands results to major modifications: the appearance of new transition bands absent in the FePc and (COOH)8FePc spectra and a significant decrease in the electron-donor effect of the COOH groups.
