acac) 2 ], a stable chelate complex, as a starting material, The mechanism of formation of nanocrystalline ZnO particles and the other is the avoidance of H 2 O in the reaction system. from the reaction of zinc acetylacetonate ([Zn(acac) 2 ]) with 2-Although these features seem to be associated with the forequivalent NaOH in boiling EtOH was investigated by characmation of uniform nanocrystalline ZnO particles, the details terizing the particles and following the transformation of acac of the reaction mechanism remain unclear.
moieties. The reaction was found to proceed via hydrolysis of
In this study, elaborate characterization of ZnO particles zinc ethoxide derivatives, followed by dehydration-condensation was performed using X-ray diffraction (XRD), transmission reactions. High-resolution solid-state CP-MAS 13 C NMR measureelectron microscopy (TEM), thermogravimetric-differential ments indicate that the ZnO particles are produced through Zn thermal analyses (TG-DTA), Fourier-transformed infrared (acac)(OZn) n (acac) (3). Furthermore, it was suggested that acac 0 ligands play an important role in the generation of nanocrys-(FT-IR), and high-resolution solid state 13 C NMR based on talline ZnO particles by suppressing the hydrolysis-condensation the techniques of magic angle spinning coupled with crossof Zn(acac)(OZn) n (acac). α§ 1998 Academic Press polarization (CP-MAS) (12). Furthermore, the chemical Key Words: mechanism; [Zn(acac) 2 ]; nanocrystalline ZnO partransformation of acac 0 ligands during the reaction was folticle; CP-MAS 13 C NMR; EtO 0 ; Zn(acac)(OZn) n (acac).
lowed by gas-liquid chromatography (GLC) and high-performance liquid chromatograph analyses (HPLC). On the basis of these results, a plausible reaction mechanism was