Properties and adduct structure of rare earth tris-acetylacetonates with o-phenanthroline

Adducts of acetylacetonates of rare earths (M, REE) with O-phenanthroline (Phen) of the composition MA3xPhen (M=La-Lu, Y) are synthesized by different methods and studied. Phen coordination by M3+ ion is proved using infrared spectroscopy, individual character of obtained preparations and their isostructure in a series of REE derivatives is confirmed by X-ray radiography. MA3xPhen thermal stability is much higher than that of corresponding hydrates of rare-earth acetylacetonates MA3xnH2O. In high vacuum under conditions of mass-spectrometric measurements MA3xPhen adducts degradate forming volatile rare earth acetylacetonates of MA3 composition. When heating in vacuum (∼ 102 mm Hg) MA3xPhen are qualitatively sublimated not changing the composition. MA3xPhen volatility determined for the whole REE series may be of interest in practical problem solving