Three-dimensional Samarium(III) Coordination Polymer With ۱,۲,۴,۵-Benzenetetracarboxylicylate Ligand and Ethylenediammonium Cation: Synthesis, Infrared Spectroscopy Characterization, Thermal Analyses, and Crystal Structure

A new three-dimensional samarium(III) coordination polymer, {[Sm(μ۲-BTEC)(H۲O)۴](H۲en)۰.۵.۲H۲O}n (۱) (BTEC۴- is ۱,۲,۴,۵-benzenetetracarboxylicylate and H۲en۲+ is ethylenediammonium), was prepared from the reaction of SmCl۳.۶H۲O and [H۲en]۲[BCT].۲H۲O in water and in an ice bath. Suitable crystals of this complex for crystal structure determination were obtained by slow evaporation of the produced colorless solution at room temperature. Complex ۱ was characterized by elemental analysis, FT-IR spectroscopy and single-crystal X-ray crystallography. The X-ray crystallography analysis shows that this compound is a three-dimensional polymer and the Sm(III) cation is nine-coordinated in a distorted tri-capped trigonal prismatic configuration by nine O atoms from four BTEC anions and four coordinated water molecules. Also, the thermal stability of ۱ was studied by thermogravimetric and differential thermal analyses.

Keywords:

Sm(III) , ۱ , ۲ , ۴ , ۵-Benzenetetracarboxylicylate , crystal structure , Thermal gravimetric , Differential thermal analyses