Synthesis, Structure, Luminescent and Thermal Properties of Ytterbium(III) and Dysprosium(III) Complexes with 5‐Sulfoisophthalic Acid Sodium Salt

Two rare earth metal-organic framework compounds [Ybsip(H2O)5]·3H2O (1) and [Dysip(H2O)4] (2) (NaH2sip: 5-sulfoisophthalic acid sodium salt) were synthesized hydrothermally, and characterized by single-crystal X-ray diffraction, elemental analysis, and FT-IR spectroscopy. In complex 1, each YbIII atom is nine-coordinate with a distorted monocapped tetragonal prismatic arrangement. Two carboxylate groups of each sip3– molecule adopt the same μ1-η1:η1 chelating coordination model connecting two YbIII atoms. The oxygen atoms of the sulfonate group do not participate in coordination with YbIII. The whole sip3– molecule acts as a μ2 bridge to form an one-dimensional (1D) chain structure. The 1D chains are linked by hydrogen bonding to generate two-dimensional layers, and are further combined together to form a three-dimensional structure. In complex 2, the DyIII atom is nine-coordinate with a distorted monocapped tetragonal antiprismatic arrangement. In each sip3– anion, two carboxylate groups take the same μ1-η1:η1 chelating coordination mode, only an oxygen atom of sulfonate group bond to DyIII ion. The whole ligand sip3– acts as a μ3 bridge linking three different DyIII ions to generate a wave-like two-dimensional network with (6,3) topological structure. The two-dimensional networks are further linked by O–H···O hydrogen bonds to form a three-dimensional structure. The thermal and luminescent properties of both complexes are investigated.