Four novel lanthanide(III) coordination complexes based on 3,4,5-trifluorobenzeneseleninic acid

Four novel isostructural lanthanide coordination complexes [(Ln(2)(L)(6)(DMF)](n) (Ln = Nd (1), Tb (2), Dy (3), Ho (4)) were successfully assembled under hydrothermal conditions with Ln(3+) salts and 3,4,5-thfluorobenzene-seleninic acid (HL). All the complexes have been characterized by infrared spectroscopy (IR), elemental analysis, powder X-ray diffraction and single-crystal X-ray diffraction analyses. The structure analyses indicate that complexes 1-4 exhibit an infinite one-dimensional (1D) zig-zag chain structure. The solid-state photoluminescence property of complex 2 has been investigated at room temperature and it exhibits the characteristic emission bands derived from Tb3+ cation. In addition, the magnetic investigations of complexes 3-4 reveal weak antiferromagnetic interactions between Ln(III) (Dy-III for 3, Ho-III for 4) ions. Complexes 1-4 are rare examples of lanthanide(III) derivatives based on areneseleninic acids.