Crystal growth and structural remarks on malonate-based lanthanide coordination polymers

The synthesis, structural characterization and thermal study of new coordination polymers (CPs) of formula [Ln(2)(mal)(3)(H2O)(5)]center dot 2H(2)O [Ln = Ho (1.2H(2)O), Tb (1a), Dy (1b), Er (1c) and Yb (1d); mal = malonate], [Ln(2)(mal)(3)(H2O)(6)] [Ln = Sm (2) and Ce (2a)], [Ce-2(mal)(3)(H2O)(6)]center dot 2H(2)O (3.2H(2)O) and [Ce-2(mal)(3)(H2O)(3)]center dot 2H(2)O (4.2H(2)O) are presented. Complexes 1-4 have been also characterized by single crystal X-ray diffraction. The structure of 2 was previously reported (Elsegood, M. R. J., Husain, S., Private Communication, 2014) and it is very close to that of 3. In the light of these results and those previously reported in the literature for malonate-containing lanthanide(III) complexes, a detailed overview on the crystal structures and topologies of these systems is provided herein, covering CPs in one, two and three dimensions, as well as the molecular architectures assembled by hydrogen bonding from low-dimensional entities to higher-dimensional supramolecular architectures.