Abstract
The combination of metal ions with H3tbba has resulted in the formation of two three dimensional coordination compounds {[Zn(H2tbba)2(H2O)] · 2(OC3H6)} n (1) and {[Mn(H2tbba)2(H2O)] · 2(OC3H6)} n (2) (H2tbba = 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. H2tbba 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.
Acknowledgements
We thank the National Natural Science Foundation of China (Nos. 20571039 and 20171020), the Ministry of Education of China (No. 20050284031) and the Natural Science Foundation of Jiangsu province (No. BK2006124).