The research in the field of nanoparticles presents both theoretical and practical interest. A special attention is given to magnetic materials due to a wide range of applications, such as magnetic resonance images (MRI), contrast agents and hyperthermia [1]. Iron oxides are one of the most commonly used and well-studied magnetic materials. The magnetic properties are highly dependent on the size, shape and structure of the particles, that’s way the establishment of efficient procedure to obtain nanoparticles with controlled morphologies and shape is one of the most important missions in nanotechnology. Due to their large aspect ratios resulting in high surface areas, the nanowire morphology is attractive for many applications, such as magnetic refrigeration, electronics, catalysts, Li-ion batteries, pigments, gas sensors, etc. [2]. For example, the magnetorheological performance of nanowire fluid is better than the spherical particle fluid, in terms of yield stress, compression displacement, and creep recovery ratio. The aim of this study was to obtain iron oxides nanowires using an iron coordination compound as precursor. The nanoparticles with different morphologies were obtained through thermal decomposition of μ3-oxo trinuclear iron (III) acetate in presence of oleic acid and dodecylamine, in trichloroacetic acid as a solvent. The preparation procedure was optimized to obtain iron oxide nanowires where the amount of oleic acid was used as a control parameter. The obtained materials were characterized using different techniques: transmission electron microscopy, thermogravimetrical analysis, infrared spectroscopy, Mössbauer spectroscopy, magnetic measurements. The self-assembling of prepared materials was investigated using wide angle X-ray diffraction, small angle X-ray scattering and polarized optical microscopy.