Semirigid Tripodal Ligand Based Uranyl Coordination Polymer Isomers Featuring 2D Honeycomb Nets.

We report five novel uranyl coordination polymers, [(CH)NH]UO(BTPCA) (1), [(CH)NH]UO(BTPCA) (2), [(CH)NH][UO(BTPCA)][UO(BTPCA)]·(HO) (3), [(CH)NH](UO)(BTPCA)·(HO) (4), and [(CH)NH]UO(BTPCA) (5), by the utilization of semirigid ligand 1,1',1″-(benzene-1,3,5-triyl)tripiperidine-4-carboxylic acid (HBTPCA) and uranyl nitrate through solvothermal reactions. Single-crystal X-ray diffraction analysis reveals that the five compounds share a similar structure composition and local coordination mode to the exclusion of disordered water or DMF molecules. Each UO(COO) motif is connected to six neighboring units through three BTPCA ligands, generating an infinite uranyl honeycomb (6, 3) net.

[Preparation, spectral analysis and photocatalytic activities of TiO2 films codoped with iron and nitrogen].

Using tetrabutyl titanate as the titanium source, and ammonia and ferric nitrate as the sources of nitrogen and ferrum respectively, iron and nitrogen-codoped nano-TiO2 gelatins were prepared by sol-gel method. The iron and nitrogen-codoped nano-TiO2 complex films were prepared with the obtained gelatins used to coat the surface of cleaned glass slides by several times of dipping-lifting procedure, followed by natural seasoning at room temperature and calcined at 450 degrees C for 3 hours, then the films were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectrum (XPS) and ultraviolet-visible diffuse reflectance spectrum (UV-Vis). The XRD spectra o f samples showed that the Fe-TiO(2-x)Nx, filmswere of anatase structure with a few of oxygen atoms in the lattice of anatase TiO2 substituted by nitrogen atoms, resulting in the distortion of crystal lattice.