Experiment and modeling of mass-transfer processes of volatile metal beta-diketonates. II. Study of mass-transfer process of tris-(acetylacetonato) iridium(III)

Mass transfer process in tris-(acetylacetonato) iridium(III), Ir(acac)(3), is investigated using a special installation with non-stop weighing at atmospheric pressure. Mass transfer rates for this compound are measured under various experimental conditions (within temperature range 186-242degreesC, at carrier gas flow rate from 1 to 40 1.h(-1)) for powder and single crystal samples. The effect of purification and storage method on mass transfer rate is stated for this compound. Mathematical models describing sublimation processes are proposed. Comparison with earlier obtained results for tris-(acetylacetonato) chromium(III), Cr(acac)(3), is carried out. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.