Lanthanide 2-thenoates

Summary Ln(C₅H₃SO₂)₃, Ln(C₅H₃SO₂)₂(OR) and Ln(C₅H₃SO₂)(OR)₂ (where Ln=La, Pr, Nd, Sm, Tb, Gd and Dy; C₅H₃SO₂=2-thenoate anion, and OR=OPr-i or OBu-t) were prepared and characterized by elemental analysis, electronic and i.r. spectral measurements. Electronic absorption spectra show that chelates have a certain degree of covalency compared to the aquo ion. The i.r. spectra indicate interaction of ring sulphur to the metal atom in these carboxylates. Small v values suggest symmetrically bonded bidentate carboxylate groups.