Two New Aluminoborates with 3D Porous-Layered Frameworks.

Two new aluminoborates, NaKCs[AlBO(OH)]·HO () and KNa[AlBO(OH)]·5HO (), have been hydro(solvo)thermally made with mixed alkali metal cationic templates. Both and crystallize in the monoclinic space group 2/ and contain similar units of [BO(OH)] cluster and AlO tetrahedra. The [BO(OH)] cluster is composed of three classical BO rings by vertex sharing, of which two of them connect with AlO tetrahedra to constitute monolayers, and one provides an O atom as a bridging unit to link two oppositely orientated monolayers by Al-O bonds to form 3D porous-layered frameworks with 8-MR channels. UV-Vis diffuse reflectance spectra indicate that both and exhibit short deep-UV cutoff edges below 190 nm, revealing that they have potential applications in deep-UV regions.