Fluorite topology in lanthanoid coordination polymers with Di- and trimetallic building blocks

Abstract

Reaction of the pseudotetrahedral tetracarboxylic acid proligand tetrakis(4-carboxyphenyl)silane (H 4L) with salts of various lanthanoid metals has afforded three new lanthanoid coordination polymers: {[H 3O] 2[Ce 2(L) 2(H 2O) 2]•2DMF•2H 2O} ∞ (1), {[Eu 3L 2(NO 3)(DMF) 4(H 2O)] •0.5DMF•6H 2O} ∞ (2), and {Eu(HL)(DMF) 2(H 2O)]•DMF•2.5H 2O} ∞ (3) (DMF = N,N′-dimethylformamide), which have been structurally characterized by single-crystal X-ray diffraction. Compounds 1 and 2 are both noninterpenetrated three-dimensional networks that display the rare fluorite (CaF 2) topology. In compound 1, the fully deprotonated L 4- ligands act as pseudotetrahedral 4-connecting nodes and dinuclear cerium-carb..