Adducts of rare earth phenylmethylbenzoylpyrazolonates and their using in extraction-fluorometric analysis

Adduct formation of tris-phenylmethylbenzoylpyrazolanate of europium (3) with 13 donor active phosphorus-, oxygen-and nitrogen-containing additions is investigated. It is established that two molecules of additional ligand are included into coordination sphere of β-diketonate of europium. The most effective for extraction concentration and subsequent luminescent determination of europium are mixtures with tributylphosphine oxide or trioctylphosphine oxide