Heterometallic Complex of Europium(III) Trifluoroacetate with Bis(diphenylphosphoryl)ferrocene (DppfO2): Synthesis, Structure, and Thermal Stability

The reaction of aqueous europium(III) trifluoroacetate with bis(diphenylphosphoryl)ferrocene (DppfO2) in a tetrahydrofuran–benzene (1 : 1) mixture of solvents affords a new bimetallic complex [Eu2(OOCCF3)6(H2O)2(DppfO2)2] (I). The complex is characterized by X-ray diffraction (XRD) analysis (CIF file CCDC no. 2425374), IR spectroscopy, and elemental analysis. According to the XRD results, compound I is a molecular complex in which two europium atoms are linked by the bridging water molecules and trifluoroacetate anions and the terminal DppfO2 molecules are coordinated via the chelate mode. According to the simultaneous thermal analysis data, the complex is thermally stable up to 200°С, and its decomposition is accompanied by an exothermic effect at 285°С related to the desorption of four trifluoroacetic acid molecules.