Chemical assembly of the heteronuclear pivalate complex with the Li I and Fe III ions

The heteronuclear complex [Fe 4 Li 2 (O) 2 (Piv)10(H 2 O) 2 ] (1, Piv is the pivalic acid anion) was obtained by refluxing Fe III pivalates with Li I pivalates in toluene and isolated as the 1•PhCH 3 solvate with a toluene molecule. According to X-ray diffraction data, complex 1 contains the {Fe 4 Li 2 O 2 } core. The Mössbauer spectroscopy data indicate that the core comprises para magnetic Fe III ions in the high-spin state located in the symmetric octahedral environment of oxygen atoms. Thermolysis of 1 studied by simultaneous thermal analysis demonstrated thermal stability of the complex up to 225 °С. The main end product of thermolysis at 600 °С is the mixed oxide LiFe 5 O 8 .