Bis(nitrilo)tris(methylenephosphonato)dodecaaquatrihydrohexasodium Europium(III) [EuNa6H3(H2O)12{N(CH2PO3)3}2]: Synthesis and Structure

Abstract

The crystal structure of bis(nitrilo)tris(methylenephosphonato)dodecaaquatrihydrohexasodium europium(III) [EuNa₆H₃(H₂O)₁₂{N(CH₂PO₃)₃}₂] was determined; sp. gr. \(P\bar 1\), Z = 2, a = 11.0801(3) Å, b = 11.5992(3) Å, c = 14.6879(4) Å, α = 70.096(3)°, β = 77.730(2)°, γ = 80.452(2)°. The coordination polyhedron of the Eu atom can be described as a distorted dodecadeltahedron (snub disphenoid), with two vertices occupied by nitrogen atoms of two phosphonate ligands and the other six vertices occupied by oxygen atoms of six PO₃ groups. The chelate complex contains six five-membered rings Eu–O–P–C–N and six eight-membered rings Eu–O–P–C–N–C–P–O.