ELECTRET BEHAVIOR OF DINUCLEAR AND TRINUCLEAR IRON HYDRAZONE HEXACYANOFERRATE COMPOUNDS STUDIED BY THE THERMALLY STIMULATED DEPOLARIZATION CURRENT TECHNIQUE

A series of di- and tri-nuclear iron hydrazone-hexacyanoferrate comple xes have been prepared and characterized by vibrational and electronic spectroscopies, thermal analysis and by the thermally stimulated depo larisation current (TSDC) technique. The TSDC spectra, measured in the range 110-300 K, have confirmed the reorientation of (1) dipoles in t he terminal aromatic radicals, belonging to the molecule and (2) water molecules, whenever they are present in the compound or are adsorbed on it. A fraction of water molecules is loosely bound to the compound and can be removed by pumping on the sample; the related dehydration a nd hydration kinetics have been analysed.