Title :
Polarization effects in homo-binuclear and trinuclear iron complexes
Author :
Bonardi, A. ; Capelletti, R. ; Pelizzi, C. ; Tarasconi, P.
Author_Institution :
Parma Univ., Italy
Abstract :
Polarization phenomena induced by adsorption and desorption of solvated molecules in a new class of homo-binuclear and trinuclear iron complexes were investigated by means of correlated TSDC and infrared (IR) absorption spectra. {[Fe(L)]}2Fe(CN)6Cl-4H2O (where L is a bis(acylhydrazone) of 2,6-diacetylpyridine) shows a typical behavior: the TSDC bands occurring in the as-prepared pellet at ~180 and ~290 K disappear whenever the sample is stored in dynamic vacuum and a new one grows at ~155 K. The subsequent exposure to moist atmosphere causes a partial recovery of the spectrum, suggesting that loosely bound water molecules are responsible for the polarization phenomena. The adsorption and desorption kinetics analyzed by means of IR spectroscopy supported such a conclusion
Keywords :
adsorption; desorption; dielectric polarisation; electrets; environmental degradation; infrared spectra of inorganic solids; iron compounds; thermally stimulated currents; 155 to 290 K; Fe complex; IR spectroscopy; adsorption; as-prepared pellet; correlated TSDC; desorption; electrets; homo-binuclear Fe complex; loosely bound water molecules; moist atmosphere; polarization phenomena; solvated molecules; trinuclear iron complexes; Chemistry; Dielectrics; Iron; Kinetic theory; Physics; Polarization; Solids; Spectroscopy;
Conference_Titel :
Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)
Conference_Location :
Berlin
Print_ISBN :
0-7803-0112-9
DOI :
10.1109/ISE.1991.167194