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

Abstract

Four novel isostructural lanthanide coordination complexes [Ln2(L)6(DMF)]n (Ln = Nd (1), Tb (2), Dy (3), Ho (4)) were successfully assembled under hydrothermal conditions with Ln3+ salts and 3,4,5-trifluorobenzeneseleninic 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 LnⅢ (DyⅢ for 3, HoⅢ for 4) ions. Complexes 1–4 are rare examples of lanthanide(III) derivatives based on areneseleninic acids.