Synthesis, thermal study and some properties of Gd(III), Tb(III), Dy(III) and Er(III) complexes with 4,4′-bipyridine and dibromoacetates

Abstract

New complexes with formulae: Ln(4-bpy)(CBr 2-HCOO) 3 Á3H 2 O (where Ln(III) = Gd, Tb, Dy) and Er(4-bpy) 1.5 (CBr 2 HCOO) 3 Á3H 2 O, were prepared and characterized by chemical, elemental analysis and IR spectroscopy. The nature of metal-ligand coordination was studied. All of them are crystalline. Gd(III), Tb(III) and Dy(III) complexes are isostructural in one group. Conductivity studies (in methanol, dimethyloformamide and dimethylsulfoxide) were also discussed. The thermal properties of complexes in the solid state were studied using TG-DTG techniques under dynamic flowing air atmosphere. TG-MS system was used for Tb(III) (as an example of isostructural compound) and Er (III) complexes to analyze principal volatile thermal decomposition and fragmentation products evolved during pyrolysis in dynamic flowing air atmosphere.

Crystal structure of a one-dimensional coordination polymer of gadolinium dibromoacetate with 4,4'-bipyridine

“…The mixed-ligand complex was prepared by mixing 12.4 mmol of 4-bpy in 96% v:v ethanol (31.25 mL) with the freshly obtained solution of 6.2 mmol metal dibromoacetate in 8.75 mL of water at room temperature. The obtained solid compound was filtered off; washed with 40% ethanol and then with ethanol and diethyl ether mixture (1:1, v:v), air dried at room temperature and described in [21]. A new coordination polymer of gadolinium(III) of general formula [Gd(4-bpy)(CBr2HCOO)3(H2O)]n, has been obtained by slow crystallization from mother solution after separation of the solid complex Gd(4-bpy)(CBr2HCOO)3⋅3H2O [21] and characterized by single-crystal X-ray diffraction.…”

Synthesis, Spectroscopic, Thermal and Catalytic Properties of Four New Metal (II) Complexes with Selected N- and O-Donor Ligands

“…The second ligand has carboxylate group which can create different types of binding with metal ions [ 9 , 10 ]. It often acts as bidentate ligand, through electron pairs of two oxygen atoms in its molecule [ 11 , 12 , 13 ]. In addition, it is used in various industries and in chemical synthesis for the production of other important chemicals.…”