Abstract
The thermal decomposition course of Zn(acac) 2, Zn(C 5H 7O 2) 2 · 2H 2O, was characterised to the onset of formation of ZnO. The techniques employed were thermogravimetry (TG), differential thermal analysis (DTA), infrared spectroscopy (IR) and X-ray diffractometry (XRD). The results obtained showed that Zn(acac) 2 dehydrates in two consecutive steps at 87 and 110°C, melts at 143°C and, then, releases C 3H 4 to yield Zn(CH 3COO) 2 at 209°C. Subsequently, the acetate released CH 3COCH 3 and CO 2 to give (ZnCO 3) x · (ZnO) y at 240°C, which on further heating to 665°C, decomposed giving ZnO. IR spectroscopy of the gaseous products revealed that a profound chemical reactivity at the gas/solid interfaces was generated throughout the decomposition course. As a result, CH 3COCH 3 was involved in bimolecular interactions over freshly genesised ZnO surfaces, producing CH 4 and (CH 3) 2CCH 2 (isobutene) in the gas phase and acetate surface species.
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