4-Chloro-2-methoxybenzoates of heavy lanthanides(III) and yttrium(III): Thermal, spectral and magnetic behaviour

4-Chloro-2-methoxybenzoates of heavy lanthanides(III) and yttrium(III) were obtained as mono-, di-, tri-or tetrahydrates with metal to ligand ratio of 1:3 and general formula Ln(C 8 H 6 ClO 3 ) 3 · n H 2 O, where n =1 for Ln =Er, n =2 for Ln =Tb, Dy, Tm, Y, n =3 for Ln =Ho and n =4 for Yb and Lu. The complexes were characterized by elemental analysis, FTIR spectra, TG, DTA and DSC curves, X-ray diffraction and magnetic measurements. The carboxylate group appears to be a symmetrical bidentate chelating ligand. All complexes are polycrystalline compounds. The values of enthalpy, Δ H , of the dehydration process for analysed complexes were also determined. The solubilities of heavy lanthanide(III) 4-chloro-2-methoxybenzoates in water at 293 K are of the order of 10 −4 mol dm −3 . The magnetic moments were determined over the range of 76–303 K. The results indicate that there is no influence of the ligand field of 4f electrons on lanthanide ions and the metal ligand bonding is mainly electrostatic in nature.