Synthesis, Structure, and Physical Properties of a Barium Complex with 5-Sulfoisophthalic Acid Sodium Salt

The complex [Ba(3)(sip)(2)(H(2)O)(9)]center dot H(2)O (1) (NaH(2)sip = 5-sulfoisophthalic acid sodium) was synthesized and characterized by single-crystal X-ray diffraction. Structural determination reveals that the asymmetric unit in 1 contains two crystallographically independent Ba(II) atoms. The Ba1 atom is eight-coordinate with distorted mono-capped pentagonal bipyramidal arrangement, whereas the Ba2 atom is ten-coordinated with bicapped tetragonal prismatic arrangement. The two carboxylate groups of sip(3)-adopt different coordination modes, mu(2)-eta(1):eta(1)-bridging, and mu(2)-eta(2):eta(1)-bridging. The sulfonate group coordinates to three different BaII atoms in a tridentate mu(3) mode to generate a ladder-like one-dimensional chain. The chains are connected by mu(2)-eta(1):eta(1)-bridging carboxylate groups to form a wave-like two-dimensional network, which are further linked by sip(3)-anions to generate a three-dimensional structure. The thermal stability and luminescence properties of complex 1 were also investigated.