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James Jenkins, Christian Dempsey, & Gregory Jackson

Combining neodymium (Nd) with the terephthalate (TP) ligand and glutarate (Glut) entities under hydrothermal conditions at 170˚C resulted in the formation of an Nd-coordination polymer of formula Nd2(Glut)2(TP)(H2O)4•17H2O with spacious pores of ~140 Å3. The pure Nd2(Glut)2(TPNH2)(H2O)4•17H2O analogue can be synthesized through replacement of all TP with TPNH2. However, in order to obtain structurally identical compounds with other lanthanide (Ln) elements the previously applied hydrothermal methods failed. Throughout the last two years we developed and refined slow diffusion methods at room temperature to succeed in the synthesis of other Ln-counterparts. This method enabled us to obtain the corresponding La, Ce, Pr, and Sm compounds. Throughout the synthesis we discovered Ln-compounds that assemble as Ln(Glut)Cl*THF*XH2O that can be converted into THF free Ln2(Glut)3*XH2O via recrystallization in water (with Ln = La, Ce, Pr, and Nd). It seems that these compounds form as intermediates and could, if isolated, serve as potential starting materials for the synthesis of other Ln-open framework compounds that have been inaccessible so far. Using these slow diffusion methods we further obtained a new and very porous neodymium sulfoterephthalate glutarate compound, whose structure will be showcased in this presentation.

Project Title

Lanthanide glutarate chlorides with interstitial THF: Intermediates on the route to lanthanide open frameworks?

Faculty Mentor Name

Ralph Zehnder


FREP Grant, Zehnder 2014-2016Work at Some of this work was started at Los Alamos National Laboratory and supported under the Heavy Element Chemistry Program at LANL by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (contract DE-AC52-06NA25396).