Moessbauer study of iodine-doped fluoroaluminum phthalocyanine

Fluoroaluminum phthalocyanine (AlPcF) is the compound that has the one-dimensional chain structure, in which flat plate phthalocyanine complex makes a laminate, and it has been known that by doping it with an electron receptor like iodine, its electric conductivity increases. As for the form and electronic condition of doped iodine, its charge transfer and the interaction of iodine and AlPcF are not well known. The ESR signal observed in doped AlPcF disappears at low temperature, and the possibility that antiferromagnetic transition occurs is suggested, but it is not clear. 129I was doped in AlPcF, and its Moessbauer effect was measured, in this way, the chemical form and electronic condition of the iodine in AlPcF, and the relation of antiferromagnetic transition with the iodine concentration were studied. The AlPcF sample, the method of iodine doping, the X-band ESR measurement for antiferromagnetic transition, and the measurement of 129I Moessbauer effect are reported. The moessbauer spectra of the 129I doped AlPcF are shown, and two kinds of iodine states were confirmed in the spectrum for lowest iodine concentration. Also the Moessbauer parameters as shown. It was found that I3- took part deeply in the antiferromagnetic transition of AlPcF. (K.I.)