Naslov
Ethyl acetoacetate ligand distribution in the course of titanium n-butoxide chelation

Autori
Kurajica, Stanislav ; Škorić, Irena ; Lozić, Iva ; Mandić, Vilko

Izvornik
Materials chemistry and physics (0254-0584) 147 (2014), 3; 1058-1067

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
organometallic compounds ; nanostructures ; nuclear magnetic resonance (NMR) ; Fourier transform infrared spectroscopy (FTIR)

Sažetak
Sols obtained by chelation of titanium n- butoxide with ethyl acetoacetate, Eaa, in various ratios have been subjected to FTIR, 1H and 13C NMR, HSQC and UV–Vis spectroscopy in order to provide insight in the compounds obtained, their structure and quantitative relationships. Three compounds, the bis- chelated monomer, Ti(OnBu)2(Eaa)2, bis- chelated dimer, (Ti(OnBu)3Eaa)2 and monochelated dimer, Ti2(OnBu)7Eaa have been established. As the molar ratio Eaa/Ti(OnBu)4 increases, the coordination changes from the monochelated and bis-chelated dimer to the bis- chelated monomer. Additionally, the transesterification reaction, influencing the chemical composition of the compounds was noted. The hydrolysis of the prepared sols was partial, leaving some residual butoxy and ethyl acetoacetate groups attached to titanium. Thermal treatment of the prepared amorphous gels at 350 °C yielded with the formation of nanocrystalline anatase. It was noted that high Eaa/Tnb ratio slightly retards the anatase formation.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA