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Preparation of complexes of ferrophthalocyanine with imidazole, piperidine, pyridine, and several substituted pyridine derivatives (Rpy where py = pyridine and R = CH3, OH, Cl, CN, CHO) is reported. A metal-to-macrocycle charge-transfer band is characterized in the optical spectra of all compounds in the series. An extra band is observed in complexes with electron-withdrawing substituents on the axial pyridine. Mossbauer measurements on all the compounds have been made, and correlation of Mossbauer parameters with optical data is proposed, d, -* tt* back-donation accounts for the experimental data.

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X-ray photoelectron spectra arising from carbon Is, nitrogen Is, and iron 2p and 3s levels of metal-free phthalocyanine (H 2 Pc), iron (II) phthalocyanine [Fe (II) Pc], and several derivatives of ironphthalocyanine (FePcL), where L = CI, NO and FePcL 2 , where L = imidazole, 3-chloropyridine, 3picoline) are presented. Measurements on CIs and Nls levels are similar to those published in the literature, using the CIs main peak as an internal calibrant. Fe3s spectra show multiplet splitting for FePc and FePcL compounds while for FePcL 2 there is no observable multiplet splitting. Satellite structure adjacent to the Fe2P1I2' 2P312 lines for FePcL 2 compounds and to the Nls photolines for all compounds studied are observed. The main conclusions on the electron configuration of iron in the phthalocyanine compounds are presented and are used to discuss some unsolved charge transfer and spin state problems.

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