In this investigation, we report facile synthesis of transition metal oxides (La 2 C 2 O 5 and La 2 O 3 ) as nanoparticles. The process contained two steps: first preparation of complex [La(acacen) (NO 3 )(H 2 O)](1) where acacen= acetylacetonatoethylenediamine. Then the precursors were calcination. In first step, complex (1) synthesized using a methanolic solution of La (NO 3 ) 3 and acetylacetonatoethylenediamine. Then desired product was collected by suction filtration and characterized using Fourier transform infrared (FT-IR), Ultra Violet-Visible (UV-vis) spectroscopy and cyclic voltammetry (CV) method for electrochemical studies. The next step to prepare nanoparticles, amount of compound (1) put in silica gel and oleic acid solution for 4-hours. Then compound (1) was placed in a furnace with a temperature of 600, 700, 800 and 900°C. After calcination of title compound, this sample studied using XRD (X-ray Diffraction)and SEM (Scanning Electron Microscopy)techniques. Particle size for several diffraction and average crystallite size were measured from the XRD data based on Debye-Scherrer equation. The X-ray diffraction patterns at room temperature revealed that, highly pure and crystallized Lanthanum oxide nanoparticles as La 2 C 2 O 5 and La 2 O 3 formula with orthorhombic phases in 600°C and 900°C respectively, with an average particle size of about less than 100nm for both nano-oxide. SEM figure show that the particles have same morphology with a uniform porous surface.

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