Beryllium complexes with mono- and tripodal- phosphinoxide ligands. X-ray crystal structure of [{N(CH2PPh2O)3}Be(OH2)](ClO4)2

The ligands triphenylphosphinoxide, tris(2-diphenylphosphorylmethyl)amine and tris(2-diphenylphosphorylethyl)amine have been found to displace the coordinated water molecules from the [Be(H2O)4]2+ cation, in quite mild conditions, to give respectively the complexes [Be(OPPh3)4](ClO4)2, 1, [(N(CH2PPh2O)3)Be(OH2)](ClO4)2, 2 and [(N(CH2CH2PPh2O)3)Be(OH2)](ClO4)2, 3. The compounds have been characterized through NMR spectroscopy and X-ray crystallography. Complex 2 is the first beryllium complex with a ligand containing the phosphoryl function, whose molecular structure has been determined by an X-ray diffraction study.