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Abstract. Alpha iron phthalocyanines ( -FePc) oxygenated at low temperatures were investigated with the help of 57 Fe Mössbauer spectroscopy, magnetization measurements (SQUID) and X-ray diffractometry (XRD). Mössbauer spectroscopy revealed that upon oxygenation of -FePc, new species were formed which could be associated with Fe III Pc oxygen adducts. Unexpectedly, magnetically split spectrum of oxygenated -FePc was observed below 20 K. In-field Mössbauer spectra in a 5 T external magnetic field at 5K and magnetization measurements indicate antiferromagnetic coupling in oxygenated -FePc.

Several oxygen adducts are formed when oxygen is diffused into the interplanar spacings of solid -Fe II Pc suspended in water. The constraints imposed by the solid matrix induce formation of interesting oxygen adducts which cannot be synthesized by regular solution chemistry. One of the oxygen adducts exhibits low-spin to high-spin transition with considerable thermal hysteresis.

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