Synthesis, structure, and magnetic properties of iron ? yttrium complexes containing acetylacetonate ligands

Influence of the nature of iron, aluminium and yttrium organometallic nanocluster precursors on the formation mechanism of ceramic ZrO2 obtained by sol-gel method

“…X-ray structural study, magnetic susceptibility, M6ssbauer and XRmicroanalysis data show that single-crystalline complex 3 appeared to be hydrated Fe(II) acetylacetonate, Fe(CH3COCHCOCH3)22H20. It was also shown that such single-crystals are covered by an amorphous film based on yttrium ions and iron-containing superparamagnetic clusters [12]. It was found that polycrystalline oligomeric acetylacetonate complex 2 contains Fe(III), Fe(II), Y(III) ions and small amount of ferromagnetic mixture assumed to be superparamagnetic clusters.…”

“…So, at 1000~ iron ions slide over the faces of zirconium polyhedra and precipitate as individual ot-Fe203. The lack of direct iron-yttrium bonds [12] with high concentration of iron, perhaps causes the destruction of single phase oxide found at 1000~…”

“…Precursors 2 and 3 were also obtained as a result of electrochemical dissolution [12]. X-ray structural study, magnetic susceptibility, M6ssbauer and XRmicroanalysis data show that single-crystalline complex 3 appeared to be hydrated Fe(II) acetylacetonate, Fe(CH3COCHCOCH3)22H20.…”

“…The trace amount of Fe(acac)3 was flushed out from the solid product with a warm mixture of hexane/acetone = 100/1. Then complex 1 was recrystallized in a mixture hexane/acetone = 6/1 ; an additional amount of complex 1 was obtained by this method according to the procedure described previously [12]. Precipitated compounds were dried in vacuum at a residual pressure of 1 Torr and over P205.…”