Yttrium Coordination Compounds with Nitrilotris(Methylenephosphonic Acid)

Abstract

Nitrilotris(methylenephosphonato)yttrium [YH₃{N(CH₂PO₃)₃}] · 2H₂O (I) and octapotassium monohydro-bis-nitrilotris(methylenephosphonato)yttriate pentadecahydrate K₈[YH{N(CH₂PO₃)₃}₂] · 15H₂O (II) were synthesized and studied. The structure of II was determined by X-ray diffraction (CIF file CCDC no. 1847628). The crystals of II are triclinic, space group P\(\bar {1}\), Z = 2, a = 11.0264(8), b = 11.3857(8), c = 16.6938(6) Å, α = 86.455(4)°, β = 85.269(4)°, γ = 85.319(6)°. The ligand molecules are crystallographically and functionally non-equivalent; one is completely deprotonated and chelates the Y atom via one N- and three O-donor centers and the other one chelates the Y atom via two O atoms.