Uptake of some lanthanides on γ-zirconium phosphate-phosphite and its 1,10-phenanthroline and 2,2-bipyridyl intercalated products

Abstract

7-Zirconium phosphate-phosphite, ~/-Zr.PO 4, H2POy 2H20, (7-ZrPP), was prepared and characterized. Direct treatment of 7-zirconium phosphatephosphite with an ethanol solution of 0.IM 1,10-phenanthrolin and 2,2'-bipyridyl gave the well defined composites, 7-Zr.PO4-H2PO3(phen)0.~5.H20 and 7-Zr.PO4.HzPO3(bipy)0.18.0.6H20 respectively. K d values of a mixture of lanthanide ions: La 3+, Sm 3+, Eu 3+ and Yb 3+ for the intercalated products and for 7-ZrPP in HNO 3 solution at room temperature and at pH 2 and 4 were determined by a radiotracer technique. 14~ 152mEu, 153Sm and 175yb radioisotopes were used for the equilibration experiment using 500 ~tl (4.0.10 -s mmole) each of the solutions of the tracers as a mixture in 7.5 M HNO 3 solution at the desired pH with 0.l g of 7-ZrPP and of the intercalated products. The selectivity order was found to be dependent on the nature of the ligand and on the pH. The 2,2'-bipyridyl product posseses, at pH 2 in general, a high K a value, specially for Sm 3+ (9815.9) compared to that of the 1,10-phenanthrolin product (3375.5) and to 7-ZrPP (419.8). This could be attributed to partial deintercalation of the 2,2'-bipyridyl at pH 2 and increasing of ionogenic groups.

Sensitized Luminescence of Lanthanides within the Walls of Polyethylenoxa-Pillared γ-Zirconium Phosphate

“…We are currently involved in the study of efficient lanthanide sensitization methods and in the building of pillared, highly porous materials based on zirconium phosphate. Although some research has been performed on the intercalation of lanthanide complexes into α-ZrP or γ-ZrP/phosphite, there is no report of such studies on pillared γ-ZrP.…”