Exploring the System Lanthanide/Succinate in the Formation of Porous Metal–Organic Frameworks: Experimental and Theoretical Study

Exploring the Ln/succinate system
and the template effect in hydrothermal
synthesis made it possible to obtain [La2(Succ)3(H2O)3]·2H2O and [Ln2(Succ)3(H2O)2] where Ln = La, Pr,
Nd, Sm, Eu, Gd, and Tb. The first case is a 2D network with a sql
plane net topology. The 3D supramolecular network is formed by strong
hydrogen bonds, which give rise to a pcu network. In the second case,
a family of 3D compounds with a bnn topology could be synthesized.
Both compounds can be obtained in the presence of 5-sulfosalicylate
(5-SSA3–) as a template agent, and the presence
of toluene in the reaction enables formation only of [Ln2(Succ)3(H2O)2] compounds. This paper
addresses a systematic synthetic and theoretical study of the formation
equilibrium of the molecules reported. The influence of the template
agent on the formation of porous MOFs and the luminescent behavior
are addressed.