Structural studies on a novel 2D polymeric barium complex of keto tautomeric form of 2-hydroxynicotinic acid -poly [aqua(μ3-chlorido)(μ3-2-oxo-1,2-dihydropyridine-3-carboxylato)barium(II)].

A 2D barium complex formulated as [Ba(C6H4NO3)(Cl)(H2O)]n was successfully synthesized by gel diffusion technique using hydrosilica gel medium at room temperature. Single crystal X-ray diffraction studies confirm that the complex is triclinic with space group P1 and exhibits a 2D framework by the interconnection of oxobridge and chlorobridge in alternative layers. The unit cell dimensions are a = 5.7737(2)Å, b = 6.8503(2)Å, c = 11.5378(4)Å, α = 106.432(2)°, β = 100.644(2)°, γ = 93.049(2)°. The crystal structure is further stabilized by a 3D one through a pair of N-H ... O intermolecular hydrogen bonds to form R2²(8) ring motifs. Each barium cation is nine coordinated to form distorted tricapped trigonal prism geometry. The gel grown crystals were characterized by several physico-chemical techniques including elemental analysis, FT-IR, UV-Visible spectral studies, powder X-ray diffraction and thermogravimetry. [ABSTRACT FROM AUTHOR]