Synthesis and structure of bis-hexaaquasodium bis-nitrilotris(methylenephosphonato)decaaquamonohydrohexasodiumlanthanate trihydrate [Na(H2O)6]2[LaNa6H(H2O)10{N(CH2PO3)3}2] · 3H2O

Abstract

A complex salt of nitrilotris(methylenephosphonic acid) with sodium and lanthanum was prepared, isolated, and studied. The salt [Na(H₂O)6]₂[LaNa₆H(H₂O)₁₀{N(CH₂PO₃)₃}₂] · 3H₂O crystallizes in space group P2₁/c, Z = 2, a = 11.86630(10), b = 10.55060(10), c = 19.99270(10) Å, β = 94.6760°. The La coordination polyhedron is a virtually regular rhombohedron. The Na atom is coordinated at the vertices of a distorted octahedron. Both ligand molecules chelate the La atom; each PO₃ group forms a La–O–P–O–Na bridge; the ligand denticity is 7.