FIELD: chemical industry. SUBSTANCE: described are synthesis of bridge tetraalkyl ammonium mu-oxo-perchlorodifer (III) of general formula: [R4N]3[Fe2Cl7O] wherein R is lower alkyl and method of preparing bridge tetraalkyl ammonium mu-oxo- perchlorodiferrate (III) having properties of ferroelectric. Anhydrous ferric (III) chloride is treated with tetraalkyl ammonium chloride [R4N]Cl wherein R is lower alkyl. Molar ratio is 1:(1-2). Treatment is carried out at elevated temperature in inert gas atmosphere. Solution is filtered and cooled to give desired product of formula: [R4N]3[Fe2Cl7O] wherein R is lower alkyl. Method makes it possible to prepare new compounds with dielectric constant of 3•105-3,5•106 within wide range of temperatures. EFFECT: more efficient preparation method. 3 cl, 4 ex, 2 dwg
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