Synthesis, properties of lanthanide trifluoroacetate complexes with 2-azacyclononanone and X-ray crystal structure of [Sm(CF 3COO) 3(AZA) 2·(H 2O)] 2·2AZA

Abstract

Lanthanide trifluoroacetate complexes (Ln=La, Pr, Nd, Sm, Tb, Gd, Tb, Er) with 2-azacyclononanone (AZA) were synthesized and characterized. Complexometric analysis with EDTA and microanalytical procedures agree with the general formula Ln(TFA) 3 ·3AZA; thermogravimetric curves in N 2 dynamic atmosphere show their thermal stability until about 100 °C. The europium emission spectrum indicates more than one Eu 3+ symmetry centre. The X-ray structure of the samarium complex consists of dimeric species where the metal atoms are connected through four TFA bridges, a monodentate TFA, two O-bonded AZA ligands and a water molecule complete the coordination sphere about each samarium.