This paper present the synthesis of bismuth (III) oxofumarate (BiO) C H O by solution-solid reaction due to the interaction of basic bismuth nitrates [Bi O (OH) ](NO ) 3H O and [Bi O (OH) ](NO ) H O with aqueous solutions of fumaric acid C H O . Solubility of (BiO) C H O in various organic solvents has been investigated. The morphology and phase composition of the samples was established by X-ray diffraction, scanning electron microscopy, thermogravimetric and chemical analyzes. 2 4 2 4 6 5 3 3 5 2 6 4 4 3 6 2 4 4 4 2 4 2 4