Synthesis, structure and nonlinear optical properties of three dimensional compounds

The combination of metal ions with H(3)tbba has resulted in the formation of two three dimensional coordination compounds {[Zn(H(2)tbba)(2)(H2O)]center dot 2(OC3H6)}(n) (1) and {[Mn(H(2)tbba)(2)(H2O)]center dot 2(OC3H6)}(n) (2) (H(2)tbba = 2-thiobarbituric acid anion). Compounds 1 and 2 are isostructural with metal ions bridged by four hydroxyl oxygens from four different H2tbba ligands to form a 3D network. H(2)tbba exhibits bidentate coordination with both hydroxyl oxygens participating in coordination, a new coordination mode. Nonlinear absorption and refraction of 1 and 2 in DMF are studied by using Z-scan measurement technique at 532 nm. 1 and 2 possess nonlinear optical absorption and self-focusing.