Behrsing, Thomas, Deacon, Glen B., Junk, Peter C., Skelton, Brian W., Sobolev, Alexandre N., and White, Allan H. (2013) Hydrated rare earth structural networks containing the phenylene-1, 2-dioxydiacetate (PDDA) ligand. Zeitschrift fuer Anorganische und Allgemeine Chemie , 639 (1). pp. 41-48.

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Abstract

Reaction of LnCl3 with Na2(PDDA) (PDDA = phenylene-1, 2-dioxydiacetate) in a 1 to 2 mol ratio in aqueous solution yielded [Ln2(PDDA)3(H2O)6]•2H2O, structurally characterized for Ln = Ce (1), Sm (2) (redetermination), Tb (3) and Y (4) in a monoclinic C2/c array, a second related structural form [orthorhombic, Pbcn] being obtained for Tb (5), Ho (6) and Er (7). The 'domains of existence' of these two previously described forms are now extended to Ce–Dy, Y, and Eu–Er, respectively. Reaction under the same conditions for the heavier Yb3+ ion yielded [Yb2(PDDA)3(H2O)6](∞|∞)•4H2O (8), orthorhombic, Pbca. In the case of Ln = La the bimetallic species [NaLa(PDDA)2(H2O)2](∞|∞)•4H2O (9) was obtained, while reaction of LnCl3 with Na2(PDDA) in a 1 to 3 mol ratio led to the isolation of the isotypic (monoclinic, P21/c) [NaLn(PDDA)2(H2O)2](∞|∞)•4H2O) for Ln = Ce (10) and Sm (12). With the smaller Ln = Yb, the more definitively bimetallic [NaYb(PDDA)2(H2O)2](∞|∞)•3H2O (13) (triclinic, Pequation image)) was obtained, the trihydrate solvation ascribed differing from that recorded (dihydrate) in a cosynchronous report.

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